Best match to B&W DM220 s

I've recently bought a real nice, like new pair of B&W DM220s, I have them connected to a Harman Kardon AVR 635,in a 20x20 room. I want to get away from A/V and go back to stereo. I'd appreciate any input on a moderately priced Amp-preamp or integrated amp set up to maximize the B&Ws Thanks, Kirk