I have a shield 9mm right now as my only handgun, so I want a mid/full size double stack more for HD and hunting. I will still carry the shield because it is just unnoticeable by myself or anyone else, regardless of what I'm wearing. I'm leaning towards either a glock 19, or 23 because that mid-size package is what I'm looking for right now. I like the g17/g22 looks better, but I'd never carry the thing and I at least would have the ability to carry the g19/g23 should I feel the need to.
If I buy new, I'll stick with 9mm and get a 19 or even the 19x. But if I choose to buy my uncle's g23 he never uses, I would get it for MUCH cheaper than anything I'd buy in-store just because he'd sell it for so cheap. I'm good with either 9mm or 40cal, so caliber preference doesn't really matter to me. As far as I'm concerned, they are close enough in price and performance that I don't really care which I have.
As much as I love S&W, I just feel like I need to own a Glock simply because of the aftermarket and availability of anything I'd ever need for it.