Check out the Kicker ZX700.5 5chnl amp, simply bullet proof.
70W rms x 4 @ 4 ohms
85W rms x 4 @ 2 ohms
420W rms @ 2 ohms class D sub chnl
210W rms @ 4 ohms class D sub chnl
Remote bass control, only single RCA input needed. Should be able to locate for close to the price of another BA.
Or, use the ZX300.1 that you have for the sub, and pick up a Kicker ZX350.4. Nearly the same specs as the class AB side of the 700.5
(Message edited by chpthril on December 12, 2008)