I'm visiting SF next weekend, and was wondering what the best known agencies are. I checked CV and it looks like there are a lot of Independents advertising, which is different compared to down here in SD.

In order to get into any of the kdolls scene.  You'll have to find a provider that is newbie friendly.  If you don't have references, they will not clear you.  You'll have to read up on some forums and do some digging to find these girls.  Good Luck.