Subbed. I love Team Viewer! No more wasted gas to fix the parent's PC!
And for those with extensive media libraries and an HTPC...Media Center Master and Media Browser!
I'm pretty much in the same boat you are with CF 6870's. I'm waiting it out. Hoping that with the release of the 8k series the 7k series may lower some. If I had to choose between those three and had to have it right now I'd go the 7950...
In overall regards to cooling...one can never have too much airflow. As for question 3 I'd go with the multiple time suggested 212 Evo and be sure to pick up another 120mm fan to attach to it in a push pull configuration. As far as the...
That is fairly simple albeit you'll need patience. But first get your rig altogether and running. There are a few guides on here on how to overclock Bulldozer/Piledriver CPU's.
AMD OC 1
AMD OC 2
I'd second the 6300 over the 4170. Maybe a 990 mobo and a 7950. You do editing so the extra cores will help and up your ram to 16G it's fairly cheap right now.