And then read on...
While those are all helpful, it's all stuff I already know.
I guess when I say "Newb" I mean new to building a machine around HD editing and CS5. I am a member of the Geek Squad *puts up fire shield* and I know my technical stuff very well, just not the insides and out of hardware benefits for CS5.
Encoding is not enhanced or faster by using a MPE certified card, so it makes no sense to invest in a new video card.
I do hope you use RedGiant's InstantHD Pro for uprezzing to HD.
I have the early version of that board (Asrock X58) I love it more than my EVGA 760
I would populte the slots with 3x4G if I had the money.