Best PSU for my rig

What is the best and cheapest PSU 650w or 700w under $80.
cheaper the better.

my spec:
MoBo:GIGABYTE GA-Z68P-DS3 LGA 1155
CPU:i72600k
GPU:HD 6870
Ram:8gb

SLI:no
OC:yes ....4.0ghz max

thanks in advance
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