My thread that won't die is back. Finally took a chance on a motherboard upgrade from my old H61 board to the ASRock Z77-E ITX, so that I can give my poor neglected i5-2500K some more megahertz. I didn't think to do a build log as I was doing it, so by this point you can't really see the motherboard any more, but it's down there doing a fine job.
The main issue that held me back from doing this a while ago was finding the right cooler, since space is tight and the Shuttle case is limited to a 92mm fan exhaust hole on the rear. Legend has it that Asetek makes/made a 92mm sealed-water-cooler that you can't buy anywhere, and you could occasionally find on eBay, but I couldn't find one, and 92mm seems to be pretty much dead as a size now, except for the Coolermaster TX3-EVO.
It fits! Just. . . if you change the front 92mm fan for a half-thickness one. The original fan then fits on the back in a push-pull arrangement (mostly pull) and the hard drive cage then _JUST_ fits back inside with enough room to tuck the cables out of the way.
Performance? Well. . . the TX3-EVO has lousy reviews, and the performance is going to be suffering a bit from being so cramped, but on the other hand my 2500K has lept from 3.3GHz to 4.4GHz with just 1.21V to the core, full load temps on the cores hovering around 60C. That's a full 10C less than the stock cooler managed at 3.3GHz. Happy with that =)