RE: Which would you choose?
I'd have to agree with Griff. Way too general. And being that you didn't list one of the oldies like the 300 oe 338 win mag., my choice would be the 300 WSM.
Reasoning is that it is probably the most versitile of the lot without burning up too much powder and can get the job done for just about anything on this continent without pounding you too badly.