I am sure you will be getting great advise but I will give you my opinion, again its only my opinion based on preference. I think your choices on the guns are good, so in order of Reliability I would rate the G26 followed by Kahr and then the KelTec. In order of Comfort, carrying size wise its pretty much a tie between Kahr and KelTec followed by G26, if you factor in the guns weight KelTec wins, its the lightest also the thinnest. I have never had any reliability issues with any of your choices but I think there is less of an issue with the Glocks. In regards to carrying appendix I have never done it so I have no opinion, I would guess the smaller and lighter the gun the better. I usually carry IWB and any of the guns mentioned are not a problem. If I had to pick based on appendix carry I'd say Kahr over the Glock Only because of its size and weight. If size and weight are not an issue, Glock 26. The Glock unloaded weighs about 19oz the Kahr about 16 and I think the KT is about 12-13oz. Im finding the older and more decrepit I get the more I gravitate to the smaller lighter guns, even 3-4 oz make a big difference.