So if I wanna overclock past 4.5 and run SLI/Crossfire in the future I would be better off with the Gigabyte UD3H and Noctua ND-D14?
The Extreme 4, and the Evo are fine, for 4.3/4,4 GHz. Whilst they may well go past that, I wouldn't necessarily recommend either, for that. Heat removal, from Ivybridge, starts to become an issue around 4.5 GHz, so whilst it's not impossible, with good cooling, to "go on" a bit, it's a question of whether a modest extra performance gain, is really worth the hassle. When processor has had most of its life, in a couple of years, it's not so bad to try to get a bit extra, to extend its useful life, cos then it's not quite so bad, if you kill it!.