3D Work/Gaming Best of both worlds

Hey All, I really need some advice on this PC I intend to build.

It will be used for 3D Modeling/Rendering AND in-game Testing.
1 Video card. possibly 2 when I need it. And yes I will be Over Clocking to hopefully 3.33Ghz on Air Supply unless directed otherwise.



My 3 Biggest concerns right now are these:

1- I will be using this PC for working with and rendering 3D models, Do I go with Radeon or ATI FirePro? i herd there was a way to softmod a radeon to be a fire? or is that obsolete now with the 5000 series?. or is there a Nvidia Card that can take on my need?

2- I need a power supply that is mainly Quiet but can do its job I'm guessing 1220wat is a bit too much?

3- Are the Corsair Dominator's Decent? I plan to purchase 2 set's for a total of 12.



Current PC Selections
Case Cooler Master HAF 932 Full Tower
Motherboard ASUS P6T Deluxe V2
Processor Intel Core i7 920 2.66GHz
Power Supply Kingwin Mach 1 1220WAT
Video Card ATI Radeon HD5870
RAM Corsair Core i7 Dominator 6GB