I don't think power is the concern especially since his system already sounds great. Hard to beat greatness.
But yeah, if power is the concern, I think the Crown XLS1502 (300W into 8 ohms, 525W into 4 ohms, 775W into 2 ohms, SNR > 103dB) may be the answer.
It comes out to $200/Ch for the 300W/525W/775W power.
I would absolutely use these amps in my own system.
I used to own the 1st Generation XLS 2500 amps and they sounded every bit as awesome as any $20,000 "audiophile" amps I've heard.
@PENG might chime in on his experience with his QSC Pro amp also.
BTW, I just ordered a Crown XLS 1502 amp from Amazon to compare.