:cb2: Ruger.
Between the SP101 and the Taurus and Rossi there is no other choice.
Between the SP101 and the S&W Model 60, I'd still go with the Ruger. It has a fine grip that puts your hand closer to the center axis of the bore, it's a tad bit heavier and all in all the easiest small .357 to shoot. It has a strong one piece frame and it takes down with the removal of only one screw--the one on the grip. Disassembly is easy. The only negative I can think of is you will want a trigger job done on the Ruger, cause it will be heavy.
Now if you were going up to a S&W K frame, Model 65 or 66 with a short 2.5 or 3 inch barrel, that's a different story (love my K frames!), but I wouldn't want a J frame unless all you ever plan to shoot is .38s.
When my wife took her tactical firearms training she used a 3" SP101. She was hitting drop targets at 30 and 40 yards with it. Of course, she was new to shooting, and no one told her that might be hard to do. Her instructor told her to focus on the front sight, so that is what she did. She also ignores recoil, because no one ever told her about that either. She outshot the men with Sigs and S&W automatics. Her instructor (Special Forces/anti-terrorist unit) smiled when he walked by me and said, "I'd damn well to the dishes anytime she told me to!"