The Drunk Squirrel stole my point. Keep your amp and your cash, no need to upgrade a proven signal path when all you want is to add 3.1 ch to your 2 ch setup.

Panny 3000 PJ, 118" Carada, Denon 3300, PS3, Axiom QS8, PSB 5T, B&W sub, levitating speaker wire