I7 2600k and Mobo for my build?

Here is my current build, courtesy of some help from forum users before.

CPU: Intel Core i5-3570K 3.4GHz Quad-Core Processor ($229.99 @ Newegg)
CPU Cooler: Noctua NH-D14 65.0 CFM CPU Cooler ($84.99 @ Newegg)
Motherboard: Gigabyte GA-Z77X-UD5H ATX LGA1155 Motherboard ($188.49 @ Newegg)
Memory: Crucial Ballistix sport 8GB (2 x 4GB) DDR3-1600 Memory ($43.99 @ Newegg)
Hard Drive: Samsung Spinpoint F4 2TB 3.5" 5400RPM Internal Hard Drive ($119.99 @ Newegg)
Hard Drive: Crucial M4 128GB 2.5" Solid State Disk ($149.99 @ Newegg)
Video Card: EVGA GeForce GTX 670 2GB Video Card (2-Way SLI) ($399.99 @ Newegg)
Video Card: EVGA GeForce GTX 670 2GB Video Card (2-Way SLI) ($399.99 @ Newegg)
Case: NZXT Switch 810 (White) ATX Full Tower Case ($189.98 @ Newegg)
Power Supply: PC Power & Cooling 750W ATX12V / EPS12V Power Supply ($89.99 @ Newegg)
Operating System: Microsoft Windows 7 Home Premium SP1 (64-bit) ($99.99 @ Newegg)
Total: $1997.38

However, the i7-2600k is on sale for 238 today. Is it better off than the i5-3570? I do plan to OC (for the first time), so just let me know what you all think. And if it is better, what mobo would you recommend? Thank you!