Perhaps throbs an offer of 1400 for all three?
If you can only afford one consider this:
I agree with posters who find the smaller k or l frame more comfortable in the hand, I had several n frames but never shot them as well as the smaller frames.
I do not know about you but I detest stainless so for me 28. Others like the rust resistance of stainless ( I do not agree even in high humidity I have not had a blued gun rust)
It is a bit easier to find grips holsters and speedloaders for the L frame if that is important.