First, one thing you should look at is how often they
update the site.
Some places don't have much to offer to begin with, and you don't see any new stuff either.
One site that you might like is
http://www.musclepinups.com/ (use to be muscle elegance)
Lynn and Denise are regulars there. I think Amber Steel did some work there too.
It's mostly HD pictures, and low res video. (if it's like before)
It runs $25 a month recurring.
Although, most of the picture sets are posted to Saradas.
Denise Masino's website is awsome. -
http://www.denisemasino.com/Lots of pics and 30 to 40 hi res video.
You pay $30 a month. I've been a member twice.
The one I go back to is -
http://www.muscletease.com/It gets update everyday, and has great content. It's also only $14.95 a month there.
Personally, just look for a person, or a few people, that you know are at one site.
It's nice to see a good selection of pictures and video of one person.