If you want to save some money just get an i5 750. No games will go beyond 4 cores anytime soon most probably.
You'll have to change mobo if you go for the i5 as well, which could save you more money too.
Not sure how much that would save by changing mobo and cpu, but you could go a SSD as well for the OS + WoW, would be crazy performance!
Also how much is the corsair ram? You can get g.skill ripjaw ram for cheap which has good/same performance.