I would get a different MB if you want to SLI, ASRock Z77 Extreme4 + 3570k would be good, the Pro4's second PCIe slot only runs at 2.0 x4
Antec 900 is very outdated, unless thats from your old build you can get much better cases now for less or the same price.
NZXT Source 210 or
Cooler Master 912 are good budget cases,
Corsair 400r/
500r are also good cases for similar price as the 900. There are other alternatives if you don't like the looks though, and you can keep the 900 if you already own it, it's just not worth buying new atm (at the very least get a 900 v3)
If you don't care about looks then
Samsung 1600MHz 1.35v RAM is the best you can buy, it OCs extremely well and can hit 2133MHz 1.5v at 10-10-10-28 or even just 1600MHz 9-9-9-24 making it very cost effective
Use
http://pcpartpicker.com/ to see if you can get he parts cheaper anywhere else, that's a pretty expensive 560Ti.
This is much cheaper and you should be able to just OC it yourself.