Congrats on the order, looking forward to the required pics and review of the new system once you get it.

I have been buying 12 gauge wire from Monoprice.com, it is still very inexpensive and you can run it as long as you want, at least within reason for most HT applications, no "what if's" with this thicher gauge wiring. For that more cool factor I have some of Axiom's 12 gauge bulk wire and it is of outstanding quality for the price. The minimum I would look at purchasing is 14 gauge.

The sub cable is simply a shielded RCA cable, that can be bought from Monoprice as well. They have some RG6 coax sub cables which can be run for very long lengths with out signal degradation. The extra length on the sub cable will allow for difficult sub placements.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70