If you plan on upgrading the CPU to an Ivy-Bridge later on, I recommend the Asus P8Z77-V PRO.
If not, stay with the Asus P8Z68-V PRO/GEN3. Your current cpu doesn't support PCIe3.0 which would be the main difference between the Z68 board and the Z77 one.
But what about the HAF x case fans? Where would I connect them if I go the P8Z68-V PRO/GEN3
2 x Chassis Fan connector(s) (1 x 4 -pin, 1 x 3 -pin)
2 x Power Fan connector(s) (3 -pin)
4 x Chassis Fan connector(s)
1 x Optional Fan connector(s)
Also the CPU I'm getting is SandyBridge.