The '06 might be your best choice.............
unless you're going to live there, in that case, you'd have justification to buy 'em all. But the question to ask yourself is, what do I shoot the best?? If you have an '06, and if you can shoot it WELL, that's the rifle I would take, even if I was going to buy a new one. As for that Remington, when I ordered that, I'd order the McMillan before it, in the proper length of pull. That way, when the Remington came in, I'd take that B&C off and 'can it, it's trash to me. Besides, even if you kept it, it needs to be bedded, as would the McMillan. Get the foam-filled McMillan if you want to save weight, or get the Edge, if they make it for the receiver you choose. I would NOT take a gun in that kind of environment with a detachable magazine, Murphy's Law has NOT been repealed! As for magnums, I have shot numerous magnums when working up loads and loading ammo for others, and it is truly amazing, some would say unbelieveable what can be done with an accurate load in an accurate rifle. If you are going to build an '06, I'd get a good quality barrel in a 9" twist. If you want it light, I'd get a #1 or #2 contour Chrome Moly, since some manufacturers won't make a stainless barrel that light, or get the lightest stainless you can, per the maker's rules. Still not knowing what kind of shooting you regularly do, I would hope you have some sort of centerfire above .224, manybe a 6MM Rem. or .243 that you could practice with; then make the transition to the hunting rifle 7 or 8 months before you go, shooting say, at least 2 boxes every other weekend from various positions; along w/some weight training and walking to get your endurance up. See your doctor if you're taking any meds, and tell him what you want to do, see what he says. It sure ticks off the guide if the reaper decides to punch your ticket,
while he's responsible for you.
Good luck, but don't forget, you have a lot of SERIOUS work to do before you go!! Dreaming up and ordering your rifle is the easiest job you got.