I have temps of about 55c in gaming and 80c with Intel Burn Test with stock cooler.
It would be more or less the same.My i7 950 build also has temps of about 56c in gaming and 84c in IBT.So should be the same depending on the bin
If you are not considering overclocking then there is no point getting the i5 2500k unless you need the services of the better integrated video chip on it.. Now, The i5 2500k is based on a 32nm tech whereas the i5 760 is based on a 45nm tech.. The TDP for both of those chips are same though.. So I guess both will produce similar heat results.. Check out some reviews and benchmarks.. My guess is that the difference won't be much but the i5 2500 will run cooler..