I have a M686-4 and a M19-3, both with 4" barrels. You can't go wrong with either one, or a M66 for that matter. If buying a K-Frame, definitely take a look at the forcing cone, as well as a quick check of the timing and end play. In my area, it's hard to find a S&W 4" anything right now. But there are a few listings on gunbroker. I would search the three models to get a feel for prices. I'm going to say (as a general statement), if you can find any of the three in very good shape for under $450-$500, it's probably a pretty good deal. You may also get a better feel for prices, once you get to the show. Good luck.