A couple of Outlaw M-200 monoblocks would do nicely, and should cost about $400 on the used market. Plenty of power, transparent, and neutral.
The later Adcom amps (5300, 5400, etc) are also very good and can be purchase for perhaps half of that.
The later Adcom amps (5300, 5400, etc) are also very good and can be purchase for perhaps half of that.