The Z77 boards are better then the p67 so why you don't have a look for one of these? the asus p8z77-V series has quite a nice selection!
And the z77 have a better overclocking possibility, running with less voltage! but only with the SB's. The IB's apparently are less good for overclocking.
I have a hard time recommending Ivy Bridge CPUs on desktops if overclocking or heat concerns are in the picture.
Recommend Corsair Vengeance, low profile, 8GB or 16 GB
DF-85 is great case......tho putting any PSU in it but the CP-850 w/ its 10.0 performance rating is a big mistake. The CP-850 is made specifically for the DF-85, 1200, P183 and p193. The PSU has less than 1% voltage variation on the 12v rails and ripple that is barely measurable.
The H80 gets outperformed by the Phanteks and runs much quieter.....and w/o the worry of what a leak might do to ya system.....I can see WC if there's a performance advantage..... but with no advantage and more noise, I just don't see it.