I would buy the MMGs(bigger) or the MG12. Use the subwoofer (there is no sub to 100% match Maggies) only for movies. Maggies love current !! The will do plenty of slam and bass, if you give them current. The Onkyo 501 is good enough for them. But only good enough, Maggies no matter which modell can tell the difference between electronics. they get better as you upgrade your electronics.

Cheers