I'm running the same system (60s/150/QS8s) you are considering with an older HK AVR320, about 55 watts per channel. It can play louder than I need it to. Thats in about a 17'x22'x8' high room.

If you like the Outlaw go for it!

Getting to 2,000 posts; one year at a time vp160/qs8/qs4/SVS 2000/m60/Monolith 3x200 amp