first you build your system from the cpu and gpu and your budget
please use a 6420 not an e4300
then get good ram - super talent 4-4-3-10 at $93 at the egger
next is gpu - your chip can go down if your budget will not allow a good graphics card.
you need a good psu
forget all this - i have a system i sell you its $600 in parts you have for less then cost
amd am2 3600 x2 oc to 2.2ghz in lanparty mobo, with a case with a window - what else can u ask 4?
i help u email me here is some ideas: