Need PSU Help

I'm about to purchase my power supply and I would like to make sure I'm getting enough wattage. I am thinking Corsair CX 750w would do but I would love some help.

here's my build:

i5 3570k 3.4 (overclocking to 4.2)
AS Rock LGA 1155 z77 Extreme 4
Kingston Hyper X 8gb
EVGA GeForce GTX 650ti
128gb SanDisk SSD
1 TB WD Blue Hard Drive
Asus DVD drive
Asus BluRay drive
NZXT Full Phantom Case
3x 120mm fan
1x 140mm fan
2x 200mm fan
Cool Master Hyper 212 EVO CPU fan

the help would be greatly appreciated.
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  2. I would stick with the 750w. I would rather have a PSU that has alittle more wattage than one that might have to little. Keep the 750w because if you want to upgrade the GPU later you have the amps and watts to do it.
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