Here's an unequivocal answer. With the exception of the J-frame scandium and alloy revolvers, they're all fantastic for your intended use. I presently own four .357s, a 27 4" a 28 6" a 66 4" and a 19 2 1/2". I'd be hard put to decide which one of these to keep if someone told me that I'd only be able to keep one. But, if I HAD to choose, I'd keep the 19. I just love the gun's portability and I've discovered that, at distances out to about 15 yards, the short sight radius gives me minimal sacrifice in accuracy.
I also have come to believe that the K-frame triggers, at least in double action, are inherently somewhat better than the triggers on the Ns. Stands to reason, there's less mass to move on the double action pull and the cylinder doesn't have to rotate quite as far as does the big N frame cylinder (at least when comparing a six shot N with a six shot K). The trigger on my 19 is the lightest and smoothest trigger that I have on any of my revolvers. So, if you can find a 2 1/2" 19 or a 2 1/2" 66 (the 19's stainless brother), I'd recommend that you jump on it.