How big of a power supply?

[Shotgunx1x]

Finally building a new machine and I know this question is probably asked all the time. How big of a power supply will I need for this set up? I've had too many different answers using the many different calculators online and not sure if the one I've chosen is maybe too big. any kind of help would be much appreciated. Thanks

http://pcpartpicker.com/p/2lNED

 

[Supahos]

That is a pretty unbalanced build I would swap to an I5 4670k and use the money to upgrade to a 280x (I think I saw some actually back in stock on newegg this morning). As for your power supply question if you stick with the 270x a 550w would be pretty good, would probably still work with the 280x but I might would go with a 600~650 watt. I don't see one on your list at all if you had one picked out.