Price of your guess is direct out of the worehouse. And it´s a class D amp, for mids and high´s class AB sounds better.
I guess you http://www.ebay.com/itm/Soundstream-REF4-400-400W-REFERENCE-SERIES-2-CHANNNEL-AMPLIFIER-/290713352980?pt=Car_Amplifiers&hash=item43afddbb14 very good SQ amp, or the bigger brother http://www.ebay.com/itm/REF4-760-SOUNDSTREAM-AMP-4-CH-760W-SPEAKER-AMPLIFIER-/130420710309?pt=Car_Amplifiers&hash=item1e5dae1ba5