I guess it depends what you want to do with it.
If it were primarily walking around the woods, fishing, or practice for a snub, then I would go with the 63.
If this is mostly to be a range gun, then I would go with the k-frame all the way. I don't have a 617, but I do have a model 17. Used 17's can be had for around $400 if used is an option.
FWIW, my 17 has a much better action on it then the model 63 I had. The 63 is a handy and fun little gun. I guess it depends on what you want to do with it. You can always get both.