For what you want, true high current amps into a 4ohm load, I would steer you to some of the entry level pro-series amps, they will give you the power you want without paying the audiophile price for many of the other brands. Check out an amp like the QSC PLX1602 or PLX2402, partsexpress.com has the 2402 for $800 and it is rated 700W stereo into 4ohm. Balanced and 1/4" inputs, but you can get 1/4" to RCA adaptors really cheap if all you have is RCA. Or even the QSC RMX models which offer the same power but are a little cheaper. Or the Crown amps like the CE2000. Look on the pro-sound link on the right side of this page: http://www.partsexpress.com/webpage.cfm?&DID=7&WebPage_ID=219