Well Mace IMO you definately do not need a belted magnum. And you already have a .308. My favorite rifle lately for hunting in here in PA is a nice handling lever action. I have grown fond of these rifles in my old age. I just acquired a Win 94 in 32spl that I plan on using this year. My bear rifle is a Marlin Guide Gun in .45-70. I just love that rifle.
For a bolt action you can't go wrong with the good old 30-06. Another choice if you're looking for a bigger caliber is the 35 whelen (a 30-06 case necked up to .35 caliber). And if you're looking for a smaller caliber I would recommend the 7-08, 270 or .280 being that you already have a .223 and .243.
The number of choices almost seems endless.