Your setup looks great
you may want to add another 2 surround speakers for the full 7.1, and if i were you, i would probably relpace the sub with an offering from svs. PB10-ISD or PB12-ISD whatever is in your budget.
As for your other question, I would probably look at buying separates instead of a receiver using separate amps for inside and outside use, aswell as an audio switcher (i think thats what its called) which works just like a video switcher.