Holy crap upgrade that graphics card, and upgrade it like.. yesterday! Grab an ATI 4870 or 4890. Or 2 4770s, apparantly they kick ass.
Apart from that it looks good. 64-bit OS would be preferred to fully utilise that 4GB RAM.
If you're comfortable with overclocking, you might as well go for it since you have a BE CPU, make sure you've got a decent aftermarket cooler and paste though.
oh i got a coolermaster v8, up to how much should i overclock it, and what voltage?
and for graphics card is this one good enough....>>http://www.newegg.com/Product/Product.aspx?Item=N82E16814129113<<