I'd go some sort of AVR with preouts and an outlaw 7500 if you do not want to spend preamp money. If the outlaw 7500 is too much for budget, Emotiva makes great amps too. I am a fan of separates so I am biased, but overall volume level matters as well.
Just playing with a calculator, and 10 foot listening distance at 85db with +20db for peak, I'd go 200w/channel from the 7500, or Emotiva.