I'm a big fan of the N frames for Magum rounds and the Model 28-2 in 4 inch is a great revolver and is virtually the same as the 27-2 except for the flat blue finish, no top strap checkering, and the 4 inch 27-2 is a fairly rare revolverand much more expensive.

All that said you can't go wrong with a 586/686 series as the L frame is also a great choice.