I was in LA last week, and made a point to stop in to Wing Hop Fung in Chinatown on Jason's recommendation. A wonderful experience - they must have at least 40-50 different teas, mostly Chinese. I got a Dancong oolong and a nice jade TGY. Best part: they have (in my case) a lovely young lady who makes a small pot of any tea to taste! I could have spent all afternoon there, but my family keeps me on a fairly short leash when it comes to tea shops . She also let me taste a shu puerh: wet cardboard and dirt - I don't think I'll EVER develop a taste for this stuff.
Jason, a big "thanks" for mentioning this place!
Dean