Gaming Computer Build

Hi guys I'm looking to build my own PC for gaming.

I've currently got a quote from a local dealer (I'm from Australia)

http://imgur.com/XwzSC

^Above is the quote I've got now to me it seems pretty solid, but is there anything I could improve on / save money? Looking for the cheapest system possible! I know there are cheaper cases but the Phantom is just sooo sexy! I want to stroke it :3.

*Note: I'm looking at playing such games as Diablo 3, WoW, CS, DOTA etc. etc. Would like to play everything on ultra as I've never been able to before :)

DISCLAIMER: New around the block here so if I am posting this in the wrong section please let me know and I'll happily move it!