Do you have a monitor? keyboard/mouse?
With the limited info, I came up with this, probably more than you need, but under $600. If you can give a little more info, then that would be helpful http://pcpartpicker.com/p/2vbsy
Hey, I thought I posted everything, but i guess i wasn't detailed enough.
Monitor/keyboard/mouse has a separate budge, I'm guetting a dell u2412m and keyboard/mouse idc because I dont play LOL that much. Thanks for the suggestion.
I think I'm going to be using Windows 7 64bit.