Hi Ashfur...Welcome to the forums..
That is an excellant build

We like the HafX case better for it's quality and better cooling but it is another $114 and I do understand tight budgets.
This case does have a front and top 200mm fans unlike so many other picks, which is all you need for that cpu and single gtx 570. Your call as usual.
By 1080p I'm assuming the 27" runs at 1920x1080. If so than the gtx570 will play the games you listed awesome. Games like BF3 and Metro would be at high settings and Skyrim would be on Ultra.
Gtx570 1.2 GB is all you need. The 2.5GB card is more for higher resolutions but some have seen a difference at your resolution with it with an increase in fps. If the budget allows, the 2.5 GB is never a waste.
Overclocking is safe when done right and DS does it right.
You did a great job with mobo, psu, oc'ing and you even put in the free t-shirt

Edited by bprat22 - 12 Apr 2012 at 4:03am