The Anthem MCA-2 would fit your needs very well. 200 watts into 8 ohms. SE and Balanced inputs. I used a pair of them to biamp Maggie 3.6/Rs with no problems and with very acceptable sound quality for the price.. I have one remaining unit,in your price range, listed here. Anthem products are made by Sonic Frontiers.
best used amp for 300- 400
I have a system composed of a rotel rcd970 cd player, rc990 preamp, rt940 tuner, acoustic reasearch turntable with denon mc cartridge and old infinity Qe speakers and am looking to replace my amp an old dying adcom gfa-2. I have heard a rotel rb 980 in the system and it was decent but not great i am trying to find an old bryston 3b but any suggestions would be welcome, my price range is less than $400 including shipping so closer to $350 would be ideal. I listen mostly to classic rock and ska, so i want power and good bass but also want good upper frequency perfomance as well. Thanks