Re: 6800GT heat issues
I'd get a 3rd Party Cooler for it. The 6800s are known for running warm. You won't have any problems, as long as you keep it dust free, but heat is never good for hardware. Look up the Zalman VF900 or something similar to it. Almost anything will make a big improvement over the stock HSF. Don't get one of those PCI fan blowers, they are worthless. If you want exhaust, just add another case fan(s).
AMD FX-8320 Vishera 8-Core 3.5GHz (4.0GHz Turbo)
G.SKILL Ripjaws X Series 16GB (4x4GB)
EVGA SuperClocked GeForce GTX 760 2GB w/ EVGA ACX Cooler
MSI GTX 460 (Dedicated PhysX)