Help me fill in the blanks

Riflehead

Honorable
Apr 12, 2013
8
0
10,510
Approximate Purchase Date: e.g.: Within the next 30 days
Budget Range: 1200-1300$
System Usage from Most to Least Important: Gaming
Are you buying a monitor: Yes
Overclocking: Eventually though not at first
SLI or Crossfire: No
Your Monitor Resolution: would like 1920x1200

I have already purchased these parts (except the cpu cooler):

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i5-3570K 3.4GHz Quad-Core Processor ($189.99 @ Microcenter)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($32.60 @ Outlet PC)
Motherboard: Asus P8Z77-V LK ATX LGA1155 Motherboard ($119.99 @ Microcenter)
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory ($70.67 @ Newegg)
Storage: Samsung 840 Pro Series 128GB 2.5" Solid State Disk ($139.99 @ Adorama)
Case: Fractal Design Define R4 (Black Pearl) ATX Mid Tower Case ($89.99 @ Microcenter)
Optical Drive: LG GH24NS95 DVD/CD Writer ($19.56 @ Newegg)
Total: $677.79
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-04-23 21:18 EDT-0400)

Hello!
Would like advice on how best to fill the blanks based on what I have already purchased.
I am missing:
GPU - Basically deciding between 7950,670, or 7970
PSU - Everyone dismisses a lot of psu's because of the brand, which ones are the trusted ones? How much wattage do i need to overclock this system?
Monitor - Would like to spend under 200$, i guess that rules out any 120hz monitors. Should I get 60hz IPS or TN considering i will only be gaming on this.

The games I will be playing are :
Shogun 2, Rome 2, BF3+4, Planetside 2, Starcraft 2, Skyrim (heavily modded)
Im looking to build a system that can handle these games on Ultra settings with a steady 60 fps.
 

jtenorj

Distinguished
http://www.newegg.com/Product/Product.aspx?Item=N82E16814131468&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=

Seasonic built xfx or corsair are good(500w+). You can get a120 hz tn panel for less than 150 that will work fine for gaming. Hope this helps.

Edit: the psu suggested above is way too much IMHO.