Your $2000 "new" price will leave out the Bryston 6B-ST (which sold new for about $2700), but you might be able to find it used for uner $2k. I use a Bryston 5B-ST (3 x 150 wpc) to drive the center and rear surrounds (and Bryston 4B-ST for the left and right channels), and have been extremely pleased with it. I bought my 5B-ST, used, here on A-gon for $850.
If we stick to your $2k for a NEW unit, however, you should consider the Bryston 5B-SST (about $1700 new); Adcom 5503 (about $1500 new); as well as the 3-channel units from Rotel and Parasound, all of which offer a lot of performance at your stated price range.