You should be able to play those games on a mix of High/Ultra @1080. When you start to become discontent with the graphics, just slap in a new GPU in a few years.
Increase the speed of the RAM. Haswell chips benefit from faster RAM.
PCPartPicker part list /
Price breakdown by merchant
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1866 Memory ($82.98 @ OutletPC)
Total: $82.98
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-11-14 20:55 EST-0500
The 750D is a big case....
The PSU is a nice one. There are cheaper solutions. I was able to get that one on sale last year on Black Friday.