The problem is, I cant decide between 45 long colt or 44 mag. I guess I could get a pair of each

Any thoughts from you cowboy shooters out there? Is one more "authentic" than the other? I think the 45 would be more "old west" but I have also always wanted to get, as Dirty Harry once said "the most powerful handgun in the world" (although no longer true, you know what I mean lol)