You should be able to find some used Rogue Audio M-180 monoblocks well under your budget (they are $6500 new).
I have them in my main system. They are detailed and dynamic and fairly neutral. I wouldn't classify them as "bright", they are in many ways closer to a good solid state amp (great bass control, neutral, quiet) than they are to some of the warmer, syrupy tube amps out there.
I have them in my main system. They are detailed and dynamic and fairly neutral. I wouldn't classify them as "bright", they are in many ways closer to a good solid state amp (great bass control, neutral, quiet) than they are to some of the warmer, syrupy tube amps out there.