Looks good to me.I wouldn't switch motherboards.Nice build you did your homework.I can tell lol. I don't buy $130 motherboards as i tend to find they skimp in areas or cut corners prime example:
The Z77 Extreme4 can be purchased for as little as $130. Taking a look at the current availability of Intel Z77 motherboards at popular retailers confirms that this motherboard is an absolute bargain and I would say – if you are on a tight budget then give this board some consideration, you should certainly consider it.
The only negative I have for this motherboard is that it slips outside of typical ATX specifications. It’s 3cm thinner than a standard ATX motherboard and as a result may lack secure mounting on the far side since this isn’t a common size, which also means you should be very careful when plugging in the 24-pin ATX motherboard power – as the motherboard may flex.That's not really a big deal to some for me it's the principle i don't want to pay money for something like that i rather pay more for a flawless board with some extra features.PSU - If you plan to just run one 670 then I would only go with 600W. If you plan on ever running SLI 750W is fine.