The other day I got a chance to hold the Smith model 60 with the 5 incher, wow, that one is now on my list of must haves, would be great for this, light, tough, and long enuf barrel to help the noise and recoil a bit. Not to mention Smooooooth.
I have an sp101 3" and that would work fine, also have a gp100 and a vaquero. All of these would be just fine with the right amount of practice.
good luck, and have fun choosing
Dave