Sig p225 is my personal favorite.
Can't imagine why else you'd want a single stack 9mm.
Guys like me with small hands appreciate the difference in grip thickness. And for a range gun, it doesn't matter if it's single stack or double stack. I don't mind reloading more for a gun with a single stack magazine. I shoot a lot of revolvers too, so high capacity guns don't hold any special significance to me.