I already have an Intel i5 4670k, Cooler Master Hyper 212 EVO, Corsair Vengeance 8gb (2 x 4gb), Western Digital 1tb Caviar Blue, Samsung 840 PRO Series 128gb, MSI GeForce GTX 760 2gb, and ASUS DRW-24B1ST. Also, should get the MSI Z87-G45 or MSI Z87-GD65? Also, I wondering what case should I get? Also, I was wondering what power supply should I get? Also, I was wondering what operating system should I get? Windows 7 Home Premium SP1 (OEM) (64-bit), Windows 8 (OEM) (64-bit), or Windows 8.1 - (OEM) (64-bit)?
The OS is whatever you prefer. If you get 8, go for 8.1. The G45 will work just fine for you. The NZXT Source 210 is a great mid tower, for a full I would get a CM Storm Stryker. You want an 80+ bronze 650w or higher PSU.