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.