I am considering this very thing. Recently moved and the new place would be difficult to wire for rear/surround speakers. I'd have to run the wires on the outside of the house in conduit. While that's not an impossible task and if this 3.1.2 system I have planned fails to deliver a suitable end product it's something I could do, it's an awful lot of work...
I am on a budget here, so I'm looking at the Sony STR-DH790 + Sony's SS-series speakers - 2x floor standing + atmos, 1x center, 1x sub.
Reading here and a few other places, this seems like a reasonable way to get some surround-ish audio without having to run wire in conduit all over the exterior of the house.
If you have any red flags to raise or alternatives to suggest that might fit in a similar budget, I'd love to hear them.