ASRock Z77 extreme4
i5 3570k (will probably overclock to around 4.0 in the future)
8gb Vengeance RAM
gtx 670 FTW Signature 2 -OR- gtx 660 FTW Signature 2
Please let me know if this is enough to power the 670 even with overclocking. I may spring for the 660 anyway though, so that could get rid of that problem.
I'm also open to PSU recommendations.
The cx600 has plenty watts/amps. I think djangoringo is hinting that with
the quality of your rig you might want to step up from budget/opening
price point PSU to something a little higher up the food chain