If those are the only three rifles that you own and you want to go down to only ONE rifle, then the .30/06 is by far the best choice... but if the "one rifle" is the scenario, an option would be to sell all three and choose one "well suited" hunting rifle... it sounds like a short action bolt rifle in .308 would be just right... you will find that with practice, you can cycle the bolt almost as fast as the lever, and given the trade-offs, the bolt action is a better "one rifle" choice.
However if you have other rifles better suited to longer range hunting, then I would go back to the Marlin 336 .30/30 recommendation... I just wouldn't want the Marlin as my ONLY rifle.