OutLaw also makes subs, SVS is a good buy, the Paradigm DSP3200 is one im looking to pair with some Studio 20v5's.
As far as amps...i think the OutLaw reciever has pre-outs, so you can prolly use it as your preamp/tuner and run an amp right out of it.
Also i see Bryston 3bst, and Classe' , and Parasound, Rotel, Cambridge, NAD, and other amps on Ebay all the time under $600. Even an old Carver would do nicely. Just google some reviews on how that amp would do with the MMGs impedence before you buy it. If the OutLaw reciever doesnt choke, i guess the other amps would be fine then.
Youre the first person ive seen with one of those recievers. Ive suggested that to many people and nobody has purchased one that i know of. Nice reciever.
Also....dont expect the MMG to crank. Its a good speaker, but not meant to make your house a rock concert. If that Outlaw at 160w per ch at 4 ohms on those MMGs isnt loud enough, then you should be looking at some different speakers for times when you want to crank it.