If you aren't going to carry it I'd get a L or N Frame, 4 inch minimum. Or if $ is tight I'd check out a Ruger GP100.
In my neck of the woods the price difference between the S&W and Ruger is minimal. I am sure others on this forum will disagree but fit, finish and weight of a 4" 686 vs GP100 is very comparable. Hold and/or shoot both, the Ruger may surprise you.