When my Sweetie was going to GUNSITE, I gave her free run of my gunsafes to choose what she liked best. After shooting all the 9mm service pistols I have (and that's most of them, for sure), she chose an FNP-9 9mm (which she shot excellently at GUNSITE and is now her bedside gun).
That said, you know I like the SR9s because they pretty exactly emulate a 1911 grip. When I went through the GUNSITE 250 class with one a couple of years back my scores were the same as with a 1911.
I would also STRONGLY recommend that you look at the new 4th Gen Glocks...they're built on the slightly smaller gripframe with the option of interchangeable backstraps as his hand grows. I thought the new double spring recoil system made a HUGE difference int he way the gun shot. My Sweetie, who has never been a Glock fangirl, took the G17 4th Gen and was ringing a 12-inch 25 yard plate on quick shot after the other.
Michael B