There are some great buys on audiogon for Bryston, Plinius, BAT, PSA BHK and a few others.
You may want to consider some digital amps like the PSA M700 monos or something from the Digital Amplifier Company who is running a sale on their amps. Their cherry amps are oh so smooth and powerful. There is a guy on the Audioshark forum that raves about his PSA M700's. He had the 300's and say these are a huge step up.