That power supply is too wimpy. Not enough +12V. You can do better for the money.
Output +3.3V@30A, +5V@28A, +12V1@14A, +12V2@15A, -12V@0.3A, +5VSB@2A
You need 17 or 18A on the +12V rails.
Better choice
http://www.newegg.com/Product/Product.asp?Item=N82E16817103931
+3.3V@32A, +5V@40A, +12V1@19A, +12V2@19A, -12V@1A, +5VSB@2A
The 1600 PRO video card is a poor choice. It is 1/5 the performance of a top end card. And at the Best Buy price of $250 it's twice what you should pay for it. I just looked through the Best Buy website and their cards are all way over priced.
Are there any other stores near you that carry computer equipment? I prefer shopping locally on more expensive items like video cards. The return and exchange policies are better and less hassle.
You can get an X800XL or 7600GT at newegg for under $180 and they are 3 times faster than the 1600 Pro. The X850XT is 4 times faster and goes for around $190.
A faster processor won't make any noticeable difference in your game performance. And the integrated graphics you have now is even slowing down your surfing and desktop performance.