God damn, finding a proper cooler is a clusterfuck. I decided on buying the Arctic Liquid Freezer II 360 but of course it doesn't fit in my Define 7 with four Trident Z DIMMs apparently so I promptly canceled it. Why am I even bothering to build a new computer at this point..
As for board, and...
I liquid metalled my M6400 Covet and also bought another QX9300 off eBay. I managed to hit 4.25 GHz stable at 1.5v, YES!
Also bought a non-Covet M6400 with rather awesome specs off Marktplaats which i'm thinking of parting out, not sure yet.