I have a 2.5" M19 that I have carried for years. The finish has worn as you would expect, so I have started using an Alien Gear IWB (sized for K frame). It is not an exact fit to the gun, but it conceals very well - and as noted, I am no longer very concerned about any wear marks.
I used a Simply Rugged for a while, but found it inadequate for the 2.5" barrel - the leather did not hold its shape as well as I would expect from a holster at this price point.
Like Chief38, I have found the simple leather pouch with belt clip to be pretty comfortable with this gun under the right circumstances.