A link to a discussion about it all, 2600K with a P67 would seem to be the way to go. 2500K disappoints for now.
Hope we see Scott (jschilds) back here, though he is probably a little busy at the moment,
An important quote from Scott ----------" i thought the X58 platform was a difficult DYI build this looks to be even more laden with potential pitfalls"
— most of which seem to be down to which motherboard you choose and how to configure that particular board. I am going to wait to see which board(s) is/are best. Had my eye on the Gigabyte P67 UD5.