Intel Core i7 2600K or The Core i5 2500K?

Which one is a better value? I only use my computer primarily for gaming, lots and lots of gaming. Will the 2500K be worth the reduced price, or should I go for the gold and buy the 2600K? The winner is paired with a Corsair H70 Water Cooler and housed in a Coolermaster HAF X, motherboard is yet to be decided. Thanks for reading my question, hope someone can clear the fog in these two decisions!