Danny already recommended you a decent power supply. But if you want higher wattage than here are two:
Antec EW 650
or
SeaSonic 520
Antec EW 650
or
SeaSonic 520
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You sure you can't just try out another motherboard? The 780i chipset was well known for being unstable.
Danny already recommended you a decent power supply. But if you want higher wattage than here are two:
Antec EW 650