I was wondering which receiver I should get as both will come out to about the same price. The 500 will give me more power according to the specs but it is an older model and I dont know if i'll be nissing out on newer important technology. My HT setup will consist of Axiom audio M3ti L and R and a VP100 center with QS4 surrounds. My room is about 170 sq feet. Which do you thing would be a better option?