Congrats Micah, I also took the plunge and ordered the Epic 80-500 from the FO this week. I used Axiom 12 ga speaker wire, it is very flexible and was easy to pull around the rafters in my attic. I can't tell you about performance yet (I don't see that as a problem at all) as the ends of the wires are just hanging out of my ceiling and walls with nothing attached to them yet. I also ordered a 25 foot sub cable so that I can experiment with various locations for my sub to try and find the sweet spot. Ok lets see who gets their order first.

M80v2,EP500v2,VP150v2,4xQS8v2,Algonquins V3
Denon 3808CI
Oppo BDP-83
LG 55LW6500