I5 3570k vs i7 3770

I considered upgrading my i5-2500k to the i7-3770k because my motherboard supports it, but for the cost of a hard to find new i7-3770k i could get a motherboard, 8GB ddr4 and pay for a good portion of an i5-6600k. The performance difference between the i5-2500k and i7-3770k was only 10% or less.