g20 or 23
Full-size Glock 10mm was by far the most accurate Glock I've ever shot, and if Glock announced it was going out of business that's the one I'd rush out to buy. Glock 20. I'd also pick up one of the extended bbls.
That said, I think the Glock 23 is the best Glock overall, for anyone considering carry. Size is right, you can get aftermarket bbls to shoot lead or 9mm, and high-cap mags are plentiful.
G19 is just as sweet, just less versatile since you have only one caliber option.
Yo