A four-inch Model 63 is one of my most often shot revolvers. It is cheaper to shoot, of course, but it might be the most fun S&W I own. It will do wonders for your trigger control when shooting the little j-frame snubbies in .38 special. I have fired probably 3000 rounds double action through my 63. The action has smoothed and lightened up very nicely. Far as grips, as on any j-frame, the factory magnas and a Tyler T-grip fit the bill nicely.
I doubt you would find one for $500. If so, grab it up.