id get a better power supply.. something around 650w 80+ certified. also that gpu is ok.. but considering your other parts.. ok isnt enough.. get atsi's 5850 or a 5830 for the gpu.. a 460 might lag a little in certain games. thats what it do different if it was my rig.
the gtx 460 768mb is a great card similar in performance to the HD5830 and currently provides alot of performance for the price. i would recommend going for a HD6850.
the power supply is pretty good for the price, but you should spend a bit more and go for a power supply that has over 80% efficiency. if your not overclocking then that cpu is fine, but if you are, just go for the cheaper x4 955 and you can reach the same clocks easy.
Thanks, I upgraded the PSU to 630watts for only $10 more. And yeah, my old computer shorted out and the only parts that didn't get fried were my hard drive and old graphics card that I want to replace. I'm probably going to stick with the GTX 460 though, I'm on a tight budget and I don't want to spend $60 or so more for a better card.