Will this be enough?
 

Intel 2nd-Gen Quad Core i7 2600 3.8GHz Turbo Speed with 8MB Smart Cache
Motherboard: H61M Chipset Motherboard LGA1155 5.1 CH HD Audio GBLAN
RAM:Corsair 8GB (2 x 4GB) 1333 Memory High Performance XMS Series RAM w/ Heatsink!

Graphics: NVIDIA GTX 570 1280MB - Your Next-Gen High-End FULL HD Gaming Graphics DX11 Ready

Hard Disk Drive 3.5" 1TB 7200RPM SATA 2
22x Dual Layer DVD+/-RW/DL DVD Burner Drive
Antec Dark Fleet DF-30 Mid Tower Pro Gaming Case / Side Window / Superb Cooling
PSU: Cooler Master high efficiency (>80%) GX 650W Max. Output 780W PSU
Audio:Integrated 5.1-channel High Definition audio (Onboard)
LAN: Integrated Gigabit Network Adapter (Onboard)



yay or nay?

yes

Yes will run very well, particularly with the nosao mod.

You may be aware of this already (?) but thought I'd point it out anyway.

It's generally viewed as a good idea to go for the 'K' versions of the 2600 or 2500 Sandy Bridges as these are the only ones that will allow overclocking to any great degree. There is a small price differential but most people would say that it's worth it (even if you don't plan to overclock immediately)

I would go for the i7-2600K then, but you would also need to get a P67 chipset motherboard too in this case.