Increase in the price of a little a better thermal paste is not justified .Certainly will be better to cool the processor without top cover first tests showed no noteworthy improvement and unlock a multiplier is no longer cost . Since it is K model is not that worth mentioning. 3D tranzistors but did not show progress .
lack of competition allows behave more like a pig with puppies .
Without the protective cover will definitely be colder .I think I'll wait for Broadwell.
With better pin material and some work transfered to z97, those new Haswell will definitely clock better than your nake chip. However, I second that intel should have done it in the first release of Haswell