I would go AMD. When bulldozer comes out you can upgrade. Plus the intel is 360 bucks. Amd is 300. You could spend the extra money on a cooler and OC. Its BE so you can overclock easily with aftermarket cooler. Good Luck!!!
Does that motherboard have a specific feature that you want to use that the Asus P7P55D-E Pro doesn't have? I ask as it comes in a combo with the i5-750, which puts it at a very similiar price to the AMD option: http://www.newegg.com/Product/ComboDealDetails.aspx?Ite... And in that instance it would definitely be worth the extra ~$15 (without taking the other rebate) aslong as you don't mind that LGA 1156 will be EOL next year.
P.S. I wouldm't recommend that PSU for crossfiring 5850s anyway due to a lack of power.