^^^ listen to this man...I replaced the two front speakers and left the oem cd player. I recently went to d.c. and the car stays outside, so I haven't put any new hu's, but when I plan to, i'll get a cheapo receiver and an amp by-pass....
It really isn't that expensive man...
kappas off ebay=$50, if not kappas, get some pioneers, they're almost the same price (best price @ walmart if I remember, correctly).
cheapo hu=$85
amp bypass= $7, i think
everything here for under $150, not too bad....