Two cents from a guy who just delidded 3770k and got a 20c drop.
If you have no intention to upgrade your whole components, like me sticking with 3770k, go for older processor, delid it (or not), and get a very comfortable 4.5GHz with some good small cooler, say noctua low profile ones, and it will still shock you for a couple of years. But new technologies are always better, like my ITX built with 6400 bclk oc@4.3GHz, it almost got the same benchmark as 3770k @4.5GHz, that's 4 threads vs 8threads, and the OCed 6400 is quiet and never exceeds 65C with Deepcool Maxx300, which is a 10 dollar cooler after rebate. Overall, I would say, newer is better, based on your current setup, I would suggest Haswell i5-K and oc it, good enough for daily use and gaming. i7 only performs better when you do rendering and stuff.