I have a Pioneer DVD H/U with iPod and iPhone playback. Pioneer mid range speakers in the front and rear. Kicker sub 1000w (RMS) and audiobahn 800w (RMS) amp in the boot!
Sounds quite good...
If you are looking for a headunit to play stuff from your iPhone, be sure to get one that says iPhone playback as the iPhones have a slightly different power requirement to just normal iPods...
I have a bit of a makeshift power connection to the sub, so if anyone know of how to wire a power cable to the boot without drilling through any bodywork then shout please!