You can also consider a Crown CE-1000 power amplifier for $445. You'll find it on Parts Express's web site as well. Crown is owned by Harman International, parent company of Harman Kardon. Crown is known among professionals as an exceptionally fine performing reliable amplifier and is used worldwide in many professionally installed sound systems. Audiophiles generally turn their noses up at it for what are usually illogical reasons. But for $500, you probably won't find a better amplifier at least not new. And it's practically bulletproof.