I have a $600 budget for the tower. Some gaming. Haven't played in a long time, but, I want to be able to play Crysis 3 when it comes out. No O/S is needed. No optical drive needed. I have an old 250 GB Sata I hard drive that can be used for now (if needed). Best build will get the 'best answer' award. Other than a laptop I have nothing to game on, so I can't wait for Haswell. AND GO!!
I was originally leaning towards a AMD FX 6300 because it can be over-clocked to match the i5 and it is about $50 cheaper. Then I came across someone who did the power calculation. I checked the power myself, and realized that it would probably cost me $30 a year more for the AMD build in electric. (The machine will be on 24/7.)