If you like the .45 round and punch, try a Colt Commander with the 4.25 inch barrel. I personally liked it better than a 9mm Glock 23 although if you're going to be action shooting you'd probably shave a couple seconds off your time with a 9mm with lighter weight.
I carry a Colt Commander under a T-shirt and no one notices.
Edit: I meant the G26 not the G23 above...
Also, Colts go up in value, Plastic guns, not so much. No disrespect to Glock, they make fine weapons. I've just never seen someone sell a Glock for more than what they paid for.