Does the 3570K and the 3770K hold the same relation than the 2500K and the 2600K? If so, then I'll stick with the 3570K. IMO It's not worth the extra cost for a relatively small gain in performance.
Rig
*Corei5 3570K *Nvidia 9800GT 1GB DDR3
*Motherboard Asus P8H77M-PRO *Win7 x64
*RAM 8GB DDR3(1600)