PimpRoll has some of the best members areas, loaded with full dvd movies in a ton of niches (basically like VideosZ but with trials).
Check out their VideoTeam sites, so much niche content it's insane!
http://www.nomansplayland.com/ft=pim...ndex.html?cf=1
http://www.welikeitblack.com/ft=pimp...ndex.html?cf=1
http://www.lesbiansistas.com/ft=pimp...ndex.html?cf=1
http://www.ebonydymes.com/ft=pimp1367/index.html?cf=1
http://www.latinadiamonds.com/ft=pim...ndex.html?cf=1
As mentioned above VideosZ kicks ass but no trials and no exlcusive content but great formats.