I have a RB .454 and have been more than happy with it. The accuracy is great, and it fits my hands well too. My hands are fairly large, but I can stilll get a good squeeze on the grip. I have a titanium .44 that kicks the crap out of my hands, the RB is much more of a pleasuse to shoot.
Taking it out on the range, the movement in the hands and recoil is similar to the Smith x-frames. You can barely tell the difference between the RB .454 and smith .500, both were compensated. You could feel the .500 had a little more push, but with the rubber grips, they were both very comfortable.
I enojy shooting the RB with a 6.5" barrel more than my smith 29-2 with a 4" barrel because of the weight and the muzzle break on the RB. The .44 has more muzzle flip, making it harder on the wrists. The one thing about the .454 is that the muzzle blast is huge. Wear ear muffs at all times. I was out bear hunting, and decided after seeing nothing almost all day to pop off a round at an old bee hive on a branch (I could tell it was old and not in use) and that was a big mistake without hearing protection.
The super blackhawks with longer barrels are good hunting rounds, but still have more muzzle flip. I like the .454 because you can get some flat shooting high velocity rounds out of the gun. In the larger caliber handguns, the muzzle brake is fairly key if you are going to be taking it out shooting, makes it much easier on the hands.
All three of your choices are good ones, I would say that between the smith and the ruger, the only decision would be your preference. If you are going to put some full house .44s through it, go with the ruger.
Between all three, Go with the RB .454, for all the above reasons. I have had mine for about two years, and have had no problems, and it shoots very well.
