ive got a 220W alpine amp running 5inch alpine speakers which are in the roof trim above yer ears.
havent got a head unit, just got my ipod plugged straight into the amp via a 3.5mm jack -- aux lead.
the amp is hidden under the passenger seat next to the battery, eith the remote lead plugged straight onto the positive terminal, via a switch.
all in all works quite well, and less appealing to criminals cos they look in the window and no cd player.
oh btw my vehicle is a 90.