A6-5400K X2 is a 65 watt TDP chip, 160 watt is much more than enough.
Overclocking might raise power consumption, but unlikely enough to matter.
Best guess is 85-95 watt fot total build stressed out.
I just did a similar build but with an SSD and the ASrock mitx board. My idle power draw is 21w and load is 51w, I am underclocked and undervolted. I plan on trying an 80w or 90w pico to see if I can get the wattage lower so a 160w should be more then enough.
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