the 750W is if you want to SLI/CFX in the future take it out and replace it with your old one if you would like.
the CPU cooler is to make it not as loud as stock coolers tend to be loud of course you can Overclock with this Cooler if you would so like if not here is another build.
The Evo isn't much of a great upgrade over AMD's stock cooler (AMD's stock coolers are way better than Intel's). Something like the Zalman Optima would be a better option if you wanted an upgrade over stock.
what else do you have from this other computer? do you have a dvd burner you can keep? do you have a large hard drive you can keep?
if you do then jump on the microcenter deal on the 3570k z77 deal now for like $329, throw that in your case, get a 120gb ssd for like $80, keep your power supply, dvd optical drive, large hard drive, and get a 7950 for about $300, thats about $700 right there. get a cooler like a hyper 212 for $20 on a deal and easily overclock that intel to 4.2-4.4 no prob and your golden.