I'm no expert, but if you're looking for some power, look at the HK 7200. I just got mine (couple days ago). I went with this unit for price and that I needed some serious current for the speakers I bought (Axiom M80's). It's rated at 100 watts per channel, all seven channels. 75 amps of current.
I'm still learning how to set it up, and am about to post a question here about that very thing. But one thing is certain, I can't be in my house and crank these 80's as loud as they'll go. - and I've got 4700 squ ft.
I got the 7200 at OneCall for $900.
.....mike