it would but youre spending money on dead tech (socket 775) you can get the newer i5 for same/less money
(Good to see your guide has been made a sticky Thriffles.)
Also unless youre an avid NVidia fanboy you can get more for your money with ATI, I'd look at a 5770, 90% performance (approximation) of the 275 and half the money, with DX11
Rest of it looks solid

I can run dirt 2 with a single 5770 with everything maxed out at 1650 and its very playable. Not got fps for you though although the rest of the system probably helps with an overclocked I5 at 3.6gig.
This is my recomendation, theres 2 5770's for crossfire and 2 hdd for raid, and ive added a dvdrw to the list as i asume you may need one
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your choice.