Try this site
iBUYPOWER: July 4th Specials They have the best configurator of any site I have seen so far.....print out the spec's that fall in your budget, and compare to NewEgg....
If you have Windows 7 already you can get a 6770, upgrade the PSU to 550 watts, and upgrade to a Athlon tri core @3000 mhz on ibuypower.....starting with the 4th of July special.....
I doubt $600 would even buy a i9 CPU.......