I'm attempting to build a gaming desktop over the summer. I'd like to stay under about a thousand dollars or so, and if need be I'll sacrifice price for performance. However, I don't really have a clue about which parts are the best for it. I'd like to be able to play Skyrim, Deus Ex, TF2, and Left 4 Dead at fairly high settings with a good framerate. Does anyone know the graphics card, computer model, etc. I should get to meet my specifications?