having to keep only 2 K frames ,my brain would explode trying to make the decision.
BUT ,, a K-22 ,and a model 66 3" would fit the bill for plinking and serious carry.
For me, keeping just two K frames means for self defense.
My top pick would be my Mod 13-2 with the 3" heavy barrel. I have only one K frame, that's it.
I have a lot more J frames and a few N frames.