I am looking to upgrade my HT by adding a power amp. I have decided not to buy a 5-channel amp. Instead, I will go 2 or 3 channel. I figure 3-channel is better since the center is so important in HT, and I don't see the need to overpower the rear speakers. Can I get some recommendations for good power amps at $750 or less, new or used? Thanks. The amp will be mated with a Denon AVR 3802 and an Energy AC-300 and a pair of C-5s.