My buddy has a brand x radio delete car. He put a complete system (head unit w/iPod and aux inputs,amp,even hid the antenna!)hid very nicely in the trunk. It drives a pair of nice 6x9's in the package tray. He runs it all with a remote and it sounds very nice. Even with the trunk open it's hard to see, with it closed nobody knows it's there unless he turns it on

Look around at www.crutchfield.com .lots of options