I like my simple setup in mine, a Kenwood headunit with about 20W RMS to each speaker, not too shabby, but I'd like to get more power to the front speakers. I have 4" Infinity References in the front, and Alpine Type S's in the rear, 5.25" of course, but I only used those to get what you guys have called "rear fill". I plan on getting a small 2 channel amp to power the front speakers, giving them about 40-50W RMS, then I also plan on adding a small 10" powered subwoofer to add that right amount of bass (I'm not one to like alot of thump, so something very clear, subtle, and not so loud is perfect, in my opinion. The setup should be very nice.
-Matt
-Matt