750w is overkill for a single GPU configuration, 550w is MORE than enough to power your rig AND overclock.
On the other hand, for your screen resolution, a GTX670 is overkill, get something like a GTX660 Ti or Radeon HD7870. If you plan to upgrade to 1080p in the future, then by all means stick with the GTX670.
Mostly looks quite good. More than is necessary for your resolution, and plenty if you upgrade monitor to 1920x1080. Your 750W is too much. You only really need 500W. By all means get 550W or 600W to give yourself capacity in hand, but 750W will be inefficient.
I am not familiar with particular case, so have to assume it is OK.