If you're going to San Jose, Liquid Playground is a good place to go. Austin is the owner and real stand up dude. I bought a Oneill CGA Vest from him for mega cheap and enjoyed going there.
If going east on 580, Nor Cal Mastercraft has a good selection out there and good people that can help you out with your needs.
Off of HWY 4- The Sporting Edge have a good pro shop and you can't go wrong there either.
Milo Sport in Lafayette is pretty cool store, but the have wakeboard packages- but a best snowboard hub in my opinion.
That's just my experience and you cant go wrong with either of those shops.