I know there is a place on Polk and Eddy in San Francisco, its called... Audiologix
not the best looking shop in the city, but they provide a good quality and quick installation on car audio needs. Talk to Vinh, he helped me install my alpine system.
price is in the middle range, also, one more thing they did was they installed my HIDs and a pioneer headunit in my other car, which I have sold already without cutting any wires, so, i could revert everything back to stock if i wanted to.