what will u use it for, the 2600k is faster at everything, the 975 is an older version of the i7, the 2600k has a newer architecture and at stock clocks it is already fester, so it will kill the other.
why don't you post a build thread in the desktop section at the top of the main page, there you will get more people to help you, but i will start looking now, do you want this price with the monitors and all and how many monitors do you want, and what country are you in?