In KS we can't use a rifle caliber smaller than .23 :-( .270 is an idea though. The store I was at had both models in both calibers. What should determine .270 vs .30-06?
I can't really say anything bad about the 30-06. It does the job on anything in North America. I talked to an Alaska hunting guide and asked him how many rifles he had. His answer was one, a 30-06. There's plenty of ammo available and you can select from a wide variety of game loads including something for white tail. In fact, you can't go wrong getting a 30-06. If that's what you want, go for it. I got a .270 because for the type of hunting I do it's a fine rifle and there's less recoil. I don't ever expect to hunt Moose or Grizzly.
In fact, I would suggest you make your decision based on some range time with both types if you can arrange it. The only firm recommendation I would make, no matter which caliber you choose, go with a bolt action.