I see you are getting many questions answered. Maybe I can add a few things to help your decision.
I think you really need to identify what you want to do with the revolver. If you plan to ever use it for concealed carry, this should be a major factor in your choice. I love my Smith and Wesson 642 for CC. It is small, light, and smooth. But I would never consider hunting with it, and it's not much fun for shooting targets. My Blackhawks, on the other hand, are great for any kind of shooting EXCEPT personal defense. What I'm trying to say is, a gun's design (or in your case, choice of gun) should follow from its intened use, and some uses are mutually exclusive.
Many guys can effectively conceal a medium frame, all-steel revolver. Because of my body shape and wardrobe, I cannot. So I use my 642, an aluminum frame 4" 1911, or (occasionally) my Ruger SP-101 for that purpose.
I'd say if you can have only one gun and you're looking for the most versatile revolver available, the 4" GP-100 would be the ticket, but it will come with many compromises--it will excel in some uses, be adequate in some, and be unacceptable in others (like hunting, considering Alabama requires hunting handgun calibers to begin with the number 4 or higher). The GP is a great value and very durable, but it can't be expected to do everything well.
Alternatives would include a 4" Redhawk in 45 Colt or a 5 1/2" 44 Magnum. You could hunt with either of these if you ever got the notion to, and either one would be a fine home defense or truck gun, but even guys who are built like a tree trunk will tell you they're very big and heavy for concealment. Another choice is the Smith and Wesson model 25 (blued) or 625 (stainless) mountain gun in 45 Colt. The mountain guns have a lightweight barrel contour. They're N-Frames so they're nearly as big as a Redhawk, and they're also spendy (like $800-ish). If you don't insist on having a Ruger, these are a very capable and versatile option. You can also get a 44 magnum mountain gun, but I really like .45s.
This should give you something to chew on as you continue pondering your decision. I would echo the recommendation that whatever you do, you physically handle all these guns before making a decision. With the gun in your hand you can get more information that's useful to YOU specifically in two seconds than you'll find through weeks of online research.