I paid a fraction over £200 for this boxed retail processor, money well spent!
My last system was based around an old E4200 dual core over-clocked to 2.4Ghz, test renders, audio processing and benchmarks were done before installing the new CPU, memory and motherboard. This new CPU runs quite hot with the stock cooling so I under-clocked it down to 3.2Ghz to repeat the same tests, my new system is now 6 to 10 times faster.
Yesterday I fitted an Asus Axe square cooler, and reset the clock to 3.5Ghz; here are the temperatures in Celsius;
Idle(after 30 min's) 100% (1hr at full load)
Stock 3.2Ghz 36 91
Asus Axe 3.5Ghz 29 60
So my advise, 3rd generation CPU's will run cooler but either cost more or not perform as well depending on the model, but if you can get an i7 2700K at a decent price - buy it. Whatever you buy, get the biggest/best CPU cooler you can afford.