... there is some overkill things and other cheap things.... so with ur budget we could know what to change for cheaper or expensier...
AMD PHENOM II X4 955
XFX ATI RAEDEON HD5870
ASUS M4A89GTD PRO/USB3
XFX BLACK EDITION 750W
G.SKILL 4GB DDR3 1600MHZ PC-12800 CL7 DUAL CHANNEL 7-7-7-24
SAMSUNG SPINPOINT F3 1TB
thats what i would buy in your place