44 Magnum
Also, consider Rugers (Redhawk, Super Redhawk, Blackhawk, Super Blackhawk, Bisley) and Freedom Arms. (if you can afford it)
Maybe a Desert Eagle? I've read they're not as reliable as revolvers, but it would be nice to have a recoil system to absorb some of that recoil.
Are you ready to really get beat-up shooting a gun? Because all that extra muzzle energy is not free, especially not in a revolver.
This is another reason to go 44 Magnum; you can also shoot 44 Special. I think cowboy loads are a good option, although also expensive.
Consider getting into hand loading, whichever way you go. Around me, 44 Magnum is $25+ per box, and 44 Special is hard to find, and only seems to come in unplated, un-jacketed bullets.
Then, you have to decide how likely it is you'll ever get around to hunting with it. If it is likely, get a longer barrel revolver that can easily take a scope. If it is less likely, get a 4-5.5" barrel and forget the scope for now.
I took my Redhawk deer hunting one time. I had only one window of opportunity. The deer was probably 50 yards away in thick woods. When I cocked the revolver, she bolted. It would have been an easy shot with a rifle. Based on that experience, I wouldn't take a handgun hunting in Alaska. I'd hate to get skunked on an expensive trip like that because I brought a revolver instead of a rifle.
Still, it is quite a fun range gun, especially with light hand loads.