Read this article on <$200 gaming cpu's:http://www.tomshardware.com/reviews/best-gaming-cpu-core-i3-2100-phenom-ii-x6-1075t,2859.html
The 2300 shows up very well.
Seagate raid-0 is not a great idea.
Raid-0 is not a performance benefit to a gamer, or most other people for that matter.
Look for a 1tb WD black or samsung. Larger drives are denser and have better transfer rates.
See if you can't manage a Z68 based motherboard.
That will give you oc options if you later want to swap out for a 2500K or even a 22nm ivy bridge follow on.
It will also give you ssd cacheing. Not a bad option to speed up your hard drive.
SSD prices continue to drop.
G.skil is very good. See if you can't manage a 8gb kit of 2 x 4gb. Here is some justification:http://blog.corsair.com/?p=65