I usually hit up Whittier Cyclery on Santa Gertrudes and Whittier Blvd. It's got that "just a bunch of guys running a bike shop" feeling that I like, they know me by name, and they treat me good. A lot of other LBSs I've been to have that "we are a professional bicycle retail establishment" feel, which I get enough of in my day job. :-)

Tim.