Should be okay w/ your amp, assuming your room is not bigger than 18'W x 20'L x 12'H and you don't listen louder than 92dB from 15' distance.
Both Vanns and Onecall have been known to sell the Q900 for about $1200/pr to people brave enough to call them. I know 2 different members on AVS.
One got the 5.0 KEF set (Q900 x2, Q600c x 1, Q800 x2) for $2200.
One got the same, except the Q300 for surrounds instead of Q800, for $2200.
Both from Vanns. But you have to call on phone and tell them what I just said.