ORIGINAL: SwampCollie
If you want a bigger rifle caliber then what you have now, then get a 375 and call it a day. There isn't enough on game (not on paper) difference between a 30/06 and a 300WindBag or 338 WindBag to make it worth the money.
If I were you, I'd buy some good, bonded, or copper solid bullets for that '06, and use the change from that rifle/scope you didn't buy to go shoot a whopperelkin New Mexico.
The .338 Win Mag, is a lot better at breaking down larger game, like bears, and moose, than the 30-06, there isn't that much difference between the .338 Win Mag, and .375 H&H, except that the .338 will shoot a heck of a lot flatter. The .300 Win Mag, will also be more effective on game than the 30-06. I'm assuming most people that argue in favor of the 30-06, in the face of the .300 or .338 Win Mag, don't even own a .300 or .338 Win Mag.