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I just built a similarish PC

Z77 Sabertooth
ASUS 670
i5-3570k
8gb corsair vengence LP memory
128GB Samsung 830 SSD
1tb WD Black Caviar HDD
Sony DVD drive

I went for the Corsair 750HX power supply. It is basically fully modular, only the CPU and Motherboard power supplies are attached and it comes with plenty of cables. I chose that power to allow me to overclock the CPU (once I get a proper cooler, since I am just using the default one atm) and add a second 670, so an 850W power supply should be fine for 2 680s

I should just say, if you care at all about air flow or tidyness in your case, get a modular power supply!