Completely new to this and I really don't know what i'm doing. About 6 months ago the computer I had been using for 5+ years finally stopped working and I recently decided that it's high time I built my own gaming pc. I'm wanting room to upgrade in the future and maybe do a little overclocking. I've done a bit of looking around and found a budget build that I liked. I modified it a tiny bit and got this.
Asrock z77 extreme4
Evga Geforce GTX 660 2gb sc
Corsair Vengence 8gb (2x4gb)
Seagate Barracuda 500gb
Coolermaster Elite 430 Mid Tower
Corsair Builder 600w
Cheap $20 drive
Windows 7 Home Premium
The thing I'm worried about the most is the power supply. I've heard some negative things about it. My budget is $700-$900 US. I live fairly close to a Microcenter if that helps at all. Any help at all is greatly appreciated.
Is the 7870 that much better than the GTX 660? Most of what i've read suggests they are very close performance wise and the 660 is $20 less at Microcenter. Does the 7870 have any clear advantages that make it worth it?
Completely forgot to add that I won't be buying any of this for 3-4 months. I'll be playing Skyrim with graphics enhancing mods (which i've read is more dependant on the CPU than the GPU) and perhaps Battlefield 3 and Borderlands 2 if I get tired of playing them on console.