cbr600f4

Consider to use any decent SATA3 SSD hard drive as primary OS drive so as to make use of the Smart Cache feature of Z68 chipset. Keep the 2TB as data drive.

cbr600f4

To be honest both the SSD and HDD (mechanical) are working together as a special Hybird drive under Intel Smart Response technology, the hard drive and SSD must be set up in RAID before you install Windows. The process is not really documented with most Z68 motherboard. Here is a link to the latest version http://www.intel.com/p/en_US/support/highlights/chpsts/imsm.
Link to documentation http://download.intel.com/suppor ... logy_user_guide.pdf

cbr600f4

BTW, I would stick with the Core i5 2500k and OC to 4+GHz instead of getting an expensive i7 2600k. Once to get to that level of CPU speed the bottleneck shall be somewhere else such as the I/O (hard-drive) and RAM speed, your HD6950 is good enough compare to the rest of your listed components. May be you shall consider buying faster RAM (1600 to 1800) for better OC result.
Save the CPU upgrade money and get a nice SSD.  If you intend to use Intel Smart Response on your Z68 mobo, your SSD and 2TB HDD will be RAID together as one logical drive.  I suppose a fast 64GB SATA III SSD shall be fine. Of course a 120GB is even better :)