Amp recommendations for Acoustic Research AR 90's

I recently purchased some AR 90's, and I'm looking for a decent used, cost effective (budget is around 800.) 2 channel SS amplifier to push them. (Mono pair also on the table.)
They're pretty power hungry. (2x10" in parallel, an 8" and 2 tweeters.) They're 4 ohm speakers, that run down to 3.2 and I've heard that they need at least 200 wpc to start sounding right.
Any suggestions would be appreciated.