Recommendations for a car stereo set-up?

As far as what I want the system to do....
I listen to Rock 'N Roll and Heavy Metal. Yes, I love it loud.
I've thought about the glovebox mount, but I want to be able to keep stuff in the glove box so that is out.
I want to mount the radio under the dash. The generic under-dash plastic box they sold at Best Buy was too large. For now I want to go with a 50W x4 Pioneer like the Pioneer 6400UB, and there was a 45 watt amp I was considering along with two 6x9's haven't decided on brand/type but probably 3 way. I will mount the amp in the trunk below the package tray.
I already removed the rear seat and package tray along with the trunk divider.