JL audio has an amzing amp called the 500/5 rated as such:

Front Channels:
100 W RMS x 2 @ 1.5 ohm-4 ohm
(11V-14.5V)
Rear Channels:
25 W RMS x 2 @ 1.5 ohm-4 ohm
(11V-14.5V)
Subwoofer Channel:
250 W RMS @ 1.5 ohm-4 ohm
(11V-14.5V)

Another Great Amp, if you are a lil more on a budget is the Alpine MRP-F320 which is 50x4 + 120x1, both will suite you quite nice, the jl is a clean sounded amp, if u want the aduiophile status