So I took some time thinking about this, and here's my two cents on a few of what I think are your contemporaries. I hope I organize this well and don't take up too much of anyone's time with my thoughts. I fully understand if any of you just say tl;dr.
http://www.jerkoffinstructions.com - JOI - I think JOI is one of your strongest parallels in the states. Its content is almost identical to WIN before the whole WW debacle. Logically they work with American models ranging from amateurs and cam girls to full blown porn stars (most of these either early into the industry or veterans post prime or on hiatus). I like the fact that it seems no subject is too taboo for them. Any permutation of M/F incest has been featured and most often done very well, but since you are shying away from this for business reasons I will leave it to them from now on and not delve into it anymore. While it does seem this is roughly 40-45% of their content the remaining part is still wonderfully varied. JOI runs the gamut from straight forward scenes (i.e. delivery guy, classmate, roommate, doctor) to full blown fetish scenes (i.e. goddess worship, denial, CEI, watersports). Really hitting every topic they can to appeal to the broadest possible audience. One thing they have that WIN doesn't is multiple model scenes ranging from two to three girls at once. They also seem to cater more to tropes and idioms with both costuming and scripting. I can clearly remember one of my favorites was a scene with a girl scout in full uniform who comes to sell cookies and leaves after making a deal for much more. JOI falls short in a few areas though. Their forum support is nowhere near the WIN forums in both organization and community involvement. That is one thing I've come to love about WIN (I personally have seen around a half dozen scenes come to life from post I've made). JOI has also adopted a rather strange stance on piracy in which they have no download options and all of the scenes are streams. While there are workarounds I won't get into this is by far their worst flaw. The site seems to operate as a compliment to their clipsforsale storefront. New scenes are added first for sale a la carte, for around $1/min then they find their way to the streaming site; this process sometimes taking months and often out of order from the shooting schedule. Needless to say this can get rather annoying, but it is, I assume, how they make the brunt of their profits. The site also relies primarily on finger play from the models because, I think I've read, that would change the models rates. As I will explain further in my next section the scenes rarely include a fake cock or fake cum. Instead you are almost always left to imagine the models touching you or getting "spunked" on after a scene.
http://www.taboohandjobs.com - THJ - THJ is a side project of JOI in which many of the same models reprise their roles from from the first site only this time they deliver a full handjob in much longer videos. This is probably why JOI doesn't use many fake cocks or much fake cum because they know they will shoot similar scenes with the real deal. I would say the site is mainly recycled scenes. As previously noted the update system on the streaming sites is often out of order so it is hard to say for certain how many purely original scenes THJ has. The models who are willing to do both clearly shoot in the same costumes with slight changes to the scripting and of course a handjob to completion. This being a newer site they haven't gone nearly as far into scenarios and fetishes that the parent (JOI). They still feature multiple model scenes and still work both straight and incest angles, but with 792 videos on JOI and 118 on THJ there is quite a disparity. They also update on a less frequent basis than the first site which makes sense because of lack of material. [On a side note this may have been a contributing factor to the death of WW. I applaud you for trying to give us a reason to join the site, but you may have burned through the available scenes and models too rapidly in your desire to gain/please members.] While I do enjoy seeing these scenarios taken to the next level it seems more of a gimmick at times. After watching some of the JOI scenes all it takes is a quick search and I can find many of the same models doing full hardcore porn. This second site appears to be working for them though since they have recently announced another site.
http://www.sexpov.com - POV - At the moment this exist purely as a clipsforsale storefront, and while the stream site isn't live yet the owners have given out a teaser video through their other two sites and I must say it was very welcomed. The clip released once again has a model reprising her role from JOI, this time engaging in virtual sex. She uses dirty talk to describe what she is doing, but all of the "action" takes place behind the, for lack of a better term, fourth wall. She leans over and sucks her fingers off camera to simulate the sounds of sucking, plays with herself very close to the camera while telling you to perform oral on her, and moves in time with the camera to show having virtual sex. At the end she is "spunked" with, I assume, fake cum (I don't know though, since it is a believable amount). I can't give too much insight on POV since like I said this site hasn't gone live yet and I don't feel like paying $10+ per scene to get a taste. I'll happily be patient to wait for it to be incorporated into the family of sites since multiple memberships equal a discounted rate (at least on the other two). [This model could have done well to attract members to WW. Seemingly they make up for the lack of content, which gives longevity as described above, by giving the discount that they do.]
The owners also have a site called assespov which never materialized so I feel it doesn't deserve much mention. Basically just point of view ass worship instruction. With all of that I feel I have given their family of sites, JOI, THJ, and POV, more than enough time.
http://www.meanbitches.com - MB - The only other site that I am a member of that is in the same vein is MB, and honestly most of the site is completely unrelated to the general theme of WIN. Truth be told, I keep my MB membership purely for the Friday update which they call POV Slave Orders. Instead of making a spin off site they chose to take the same models from the rest of the week and have them shoot some degrading fetish instruction scenes which get limited release. These are definitely not your typical scenes. It's more like having a virtual mistress which you are told to obey verbatim. The scenes consist of; foot, ass, and breast worship, breath play, occasionally watersports, rarely some orgasm denial, and most always ending with CEI. While I always skip the CEI (just one icky step over the line for me) I truly enjoy the majority of these scenes. It most certainly isn't everyone's cup of tea, but I'm happy that there is a site which caters to this niche. [Understandably this type of content would probably be as well received as the WW content which scared away models, so I don't look for any sort of WINDark to start, but who knows maybe they read "Fifty Shades of Grey" last summer and have a kink they need to fulfill... LOL.]
With that I think that I've wasted enough of everyone's time and I don't blame any of you for not reading it (frankly I don't know if I would have). I just thought about this for a while and felt if it could help out in any way I would take some time on my day off to share my thoughts. As always keep up the great work Lee, and if you want me to clarify any of this all you have to do is ask.