@johnnybow did you decide on a caliber... er... cartridge?
I'd be torn between the 6.5 creed and the PRC myself (sticking with the options you seem to have for that rifle). The hate for these cartridges is completely absurd on every level except aesthetics—if you like 'good old fashioned' 'established' chamberings, by all means shart on everything new, but don't pretend it's about real-world performance.
The 6.8 Western is also a great cartridge, but it seems to have lost the popularity contest and I'd be nervous ammo availability would be pretty rough 5+ years from now. I suppose it's yet to be seen with the PRC, but the adoption out-of-the-gate has been much better than the Western already, so

. And of all the arguments one could possibly make against the Creedmore, availability is not among them.
All that said, all of the cartridges on that list will easily handle deer and elk within typical hunting ranges, and it's hard to go very wrong here. The Creed will limit you the most in terms of range, but if you're not planning to shoot elk at 500yds anyway...
Cheers!