My choice would be 357 Sig capable and the first choice.
Go with the 124 and that pretty well gets you awfully close to 357 magnum.
Frankly I would not bother on a different caliber. The only one of the 9mm, 357 Sig, 40 and the 45 that gives a significant better performance, ie. penetration in some materials) is the 357 Sig.
You will fine yourself sticking with one caliber as you will want to know and shoot it well I suspect and the other barrel combo will go unused.
Nice thing on the 9mm and the 357 sig is they share bullets (if you reload)