1-
First off I like the 3" J-Frames much better than the 1 7/8" models. They are easier to shoot accurately a no have more velocity a win, win IMHO.
2-
The 10mm does nothing better than the 45 IMHO. A 45 +P or 45 +P+ (Super) is the better way to go IMHO and I have all of them.
3-
Never fell for the 17's either.