.270, .30-06, or .308. I'd lean towards the .30s simply because of the vast availability of commercial ammunition and components for reloading. As an added benefit, the .30-06 and .308 would be sufficient for elk and moose, too. Well, the .270 would work, as well, but a .30 caliber would make me more comfortable.
I would avoid the magnum chamberings. I don't think they are necessary. Besides, I like to shoot for fun, but the magnums just wear-out my shoulder.
For actions... well, I'm partial to short actions and receiver mounted, three-position safety switches, so that really narrows the field. I like the Savage Accu-trigger, too. But, there is a nearly endless supply of Remington and Winchester parts and knowledgeable gunsmiths to work on them.
I would pick either a customized Savage (lots of bang for the buck, there) or one of the Winchester actions.