I would think that .30/06 is all you would need fro what you' ve stated, but if bears ever became a possibility maybe .300 Win Mag as the biggest. Of course there' s always getting something suitable for up to moose ( .30/06 , .270 ect.) and then adding the .300 Win Mag if and when big bears become an option.
I had a friend move to Alaska and bought a Savage 111f in .300 Win Mag in case he had the oportunity to hunt up there as well as self defense from a big brownie. When he moved back he sold it and told me the locals up there use .30/06 mostly and asked him questions like what are you going to hunt " elephants" . Having never been there myself that' s all I can tell you.