before i finally pay for my items is this a decent m/b cpu/ gpu combo
ASRock N68C-S UCC nForce 630a
AMD Phenom II X4 Quad Core 955 Black Edition 125W C3 (Socket AM3)
Sapphire ATI Radeon HD 6850 1024MB GDDR5
Coolermaster Hyper 212 Quiet CPU Cooler 19Dba 775 & AMD
along with kingston 2 X 4GB 1333 ddr3 ram
and if the asrock m/b is a good choice a 128gb ssd hard drive
Corsair Builder Series CX430 430W
i5 is your best bang for buck processor out there. Top bench marks and right now i think newegg.com has it with a $15 off promo code, so only $205. Very good cpu. If you had the money, i would look at getting a GTX580. for only another $130, its a huge upgrade. What resolution is your monitor though? that is a big thing in determining upgrading to the GTX580.
Only other thing i might add now that i look at it is see if you can find an MSI Twin Frozer II GPU. They are rated #1 right now for cooling and performance.
That mobo is based on an older chipset which may hinder performance. The original psu that you picked out is strong enough for a 6850, I would't go any higher than that. You should be able to play the game with lowered detail at 1080p, but the 6870 might be an attractive option.