At this point there are no cost effective upgrades to any of the current CPUs or platforms from your overclocked i7-920/X58 combo. The i7-3770K and Z77 combo will cost you much more money than what you'd gain in performance even after accounting for what you'd get back by selling your i7-920 and X58 combo. (And please, do not ask for a price check anywhere in these forums outside of the paid subscription access General May[H]em forum.) And since you already have a perfectly adequate CPU and a fast (but not the fastest) GPU, the only worthwhile upgrade that you can make at this point would be an add-in PCI-e USB 3.0 card (if your motherboard has only USB 2.0 capability).