Rather than the MSI Z97 PC MATE, you should get an Asrock Z87 Extreme3, as it will let you drop in a second GTX 770 later on. The MSI does not have SLI support. Also you get a few extra USB 3.0 ports. It is older tech, but i don't think you'll get any benefit from that level z97 anyway.
I added a CM Hyper 212 EVO CPU cooler to keep your temps down when you overclock.
Switched the power supply to a EVGA 750W. It is the same price and still semi-modular. It'll actually be more efficient then the Antec 620w, as PSU's tend to be most efficient around mid-draw. It would also be able to handle a second card in SLI, although it'd be working pretty hard, it would do as a stop-gap at least.
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