For me the next 2 would be a 29/629 and a 17/18
Nice group of guns. I am avoiding the semi automatics as that would just be another rabbit hole for me. The S&W revolvers are keeping me entertained enough at this point. Never lose with a 17/K22 or 27. Love the looks of the 3.5" 27.
If you like K-Frames the best, (as do I), try a 5" Model 10 or older M&P. In my hands there is nothing else that comes close. The dynamic handling qualities are simply superb in my opinion.