AS long as the P67 board doesn't have any compatibility issues, the 1155 build would be the better option. Faster and more flexible CPU, that's better suited to Dolphin and other tasks. It also uses less power, while running cooler. If you need the 960's hyper-threading, you could opt for the 2600K instead of the 2500K.
If you won't be overclocking the CPU and GPU, you can step down to a 550-650W PSU (minimum 80+ Bronze, with 80+ Gold being preferable).
I wouldn't buy either WD Green or Blue. Take a look at the WD Blacks, R4 and Samsung F3 or F4. Cooling wise, the Corsair H70 isn't worth it. You can get comparable, or better, cooling for far less money. The top air coolers perform better at lower noise levels, while the new Antec KÜHLER H2O 620 (if you really want AIO water cooling) outperforms the Corsair H50, H60, and comes within 1-2c or less of the H70. That's with a smaller rad and single fan, versus the H70's larger rad and dual stock fans. If you only intend to OC the CPU a bit,
you can pick up one of these three for ~$25-40. For a bigger OC while maintaining low load temps, you have a few options in the $55-80 range.