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
sailor720
" so i want power and good bass but also want good upper frequency perfomance as well. "

Well if this is possible ( at this price ) then all of us who have spent more than this, are wasting our money :)
Try on a B&K at this price, they're about as laid-back as a low price SS amp gets. I found the Acurus amps harsh and with lousy soundstage.
I'll second the recommendation for the B&K amps. I you shop around for a ST-140 or ST-202, you'd be able to come in under your budget, and with a nice sounding amp.
thanks for the responses, after reading some reviews the b&k sounds like the best because my system tends to be a little too bright .
I own/have owned B&K ST140, ST1400mkII, Reference 4420 amps, and all are excellent. If you do investigate the ST140, there are two versions cosmetically (one with blue racing stripes, other black with gold rack handles - I like this one better). The ST140 is a minor classic, hard to go wrong. I believe the 202 is from the same series so would be a solid amp as well.

Interconnect/speaker cable choice can also tame a bright system.

cheers,
mwilson