Best 5 channel amp for Acoustic Zen Adagos

Hey guys, first time here. I have a 5.1 withe the adagos ran off of an Arcam P1. Its a good amp, but I think it lacks pop. It's a 150 x7 and you cant bi-wire the speakers. What's a good upgrade that wont kill my bank account. New or used.
Thanks in advance
It looks like your primary concern is sound quality. If that's the case, check out Ayre and Theta. Both make some extremely good multi channel amps. Definately not your typical theatre products.
Ok will do. What models of each do you recommend? Thanks again.