I took my RSX to Audio Excellence in Oviedo (near Orlando). It was a few years ago, but they took pretty good care of me. I had them do a lot of work. They installed a headunit, Sirius Satellite radio, speakers, sound deadened most of the car, tint, and built a custom Sub/Amp enclosure. I can take a few pictures of the sub enclosure if you are interested, it turned out pretty nice I think. Then again, I spent a ton of money on it all. However, I did bring them all of the gear to install except for the head unit, which I purchased there.
Bigaudio, you should come down in January/February when I should be getting my Z.