I usually have one subscription somewhere. A list of some I've liked:
Wetlands: A nice amateur site done in a somewhat professional manner.
Suicide Girls: Porn status debatable, but there are some crazy hot girls there.
Women Of Stile: Movies are always high-quality (re: bitrate), although he tends to focus on anal sex, which doesn't do much for me.
Mike's Apartment: This is where I'm at now. A lot of content, due to the network effect (you get access to all the sibling sites), but it eventually gets old. You can only hear "Let's see what we're working with" so many times...