Don't bother with the rear shelf. With proper front speakers you won't miss it. Get some decent component 6.5s for the front doors. I have some Pioneer TS-D1720Cs in my front doors and they are amazing, especially for a 100 bucks.

I just have one Pioneer 10 in a sealed box in the trunk. Definitely not the most bass around, but enough to keep me happy. Still makes all my mirrors dance.