Here is one of the nicest amps money can buy. its a PPI Powerclass PC4100 thats 100w x 4 rms. This amp can run an entire car at 120+ decibles no problem. This sucker will pull about 80+ amps and needs 4 ga and realistic output is around 600-800w RMS esprecially when the impedance drops below 4ohms. This amp is 2 feet long. You will not be dis-satisfied. I had the PC1400 version of this (1x400rms) and it was rediculously loud and clear.
Precision Power PC4100 Amplifier PPi Car amp PC-4100 - eBay (item 230538119885 end time Oct-16-10 21:10:53 PDT)
Here's the manual.
http://www.precisionpower.com/Manual...Amplifiers.pdf
Its not mine, but happy bidding on one of the nicest amps ever made. If I didnt have my setup I'd be bidding on this!