Build with Gigabyte GA-Z68XP-UD3

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The modular function makes the price shoot up a bit, but since you're not using the second set of PCI-E power cables it would be a bit cleaner. If you're considering adding a second GPU later then just get the TX750 - you'll use almost every power cable.
Yeah PSU is overkill. A 500 to 600 would easily handle a 560ti. The Corsair 600watts would be a good choice for any future upgrades except SLI.

http://www.newegg.com/Product/Product.aspx?Item=N82E16817139028

If you plan to SLI, a good 600 watts would be able to handle it but getting a 750w would give you more headroom.

http://www.newegg.com/Product/Product.aspx?Item=N82E16817139021

If you only plan to game on the PC, then the i7 would be a waste of $100 and the i5-2500k would perform about 97% of the i7-2600k performance.
 
The modular function makes the price shoot up a bit, but since you're not using the second set of PCI-E power cables it would be a bit cleaner. If you're considering adding a second GPU later then just get the TX750 - you'll use almost every power cable.
 
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