First off, I will say that you would be happy with any of the rounds you have listed, in my opinion.
A friend built a Creedmoor and is loving it. Hornady brass seems to be pretty good quality, from what little I have messed with it.
I think it will boil down to what bullet weight you want to shoot. 260 Remmy and the Creedmoor will handle the 140 gr bullets better, while the 6.5x47 seems better suited to the 130 gr class.
After all this, my next build is going to be a 6.5x47L.