Not sure on the amplifier, but put the better speakers up front, as long as you don't have blown speakers in the back, you won't be able to really tell a difference what's back there.
98.5 SVT
91 Escort GT (almost sold)
96 ATX Zetec (i brake to watch you swerve)
FS: SVT rear sway bar
WTB: Very cheap beater
CEG Dragon Run - October 13-15