caracoustics in campbell/los gatos. i usually hate stereo shops, but the owner (howard) is a pretty decent guy when you talk to him and he's very helpful. the shop works mostly on pretty high end cars, like porsche and bentley, but when i was in there last time i saw a 69' camaro.
just make sure you know what you want when you talk to him! just like any stereo shop i'm sure he'll try and sell you more than you might need.