How do I feel?.........

Of those listed, since I assume those are the ones you are considering, I say close your eyes and point to the page and go buy the one your finger landed closest to --- any of them will work. You are way short on time and need to hurry up and start an accelerated "familiarization" process, ASAP; otherwise you could end up being one of those hunters that they tell the stories about. Buy "it", get it fitted for length by a gunsmith, have him mount the scope for you and bore sight it for you and get down to the range ASAP. If you haven't shot high power before then pay some bucks for an NRA instructor. Those calibers (even a poor fitting 270) can quickly instill some bad habits in the uninitiated. The NRA instructor should be able to get you onto the right and fast track.

---- You'll be leaving before you know it and the elk deserve decent preparation.

IMHO, this sounds like a wreck in the making, barring some serious effort being expended, just my $.02.

EKM