Upgraded especially to run this to be honest
(I´m terrible like that, can´t stand not being able to run something decent, Maddox should get a percentage of Hardware sales for the amount of people they forced to upgrade)
All in all it set me back around 750$ but I´m set for the next few years I hope and I needed to upgrade sooner or later anyway.
EDIT: Bang for bucks I think this is one of the better setups you can build. Although I might consider swapping out the HD6970 for a Gefore 580GTX.
You wont need a 2600k processor since Hyperthreading isn´t used by any game right now, make sure to get the K version of the 2500 though so you can overclock it in combination with a P67 chipset mobo. HD6970 has plenty of VRAM and power and can also be overclocked fairly easy if needed.