I voted for the G34, then replied without reading any of the other replies. I bought my G22 (full size) in 1999, then my G27 (sub compact) in 2002, both 40 S&W. I shot and carried both of them a lot. I got a Long Wolf Distributor 9mm conversion barrel for my G22 as well and a factory G31 (357 Sig) barrel for it. I liked the 9mm barrel so much that I bought my G34. It's the most accurate pistol I've ever had. And I like the 9mm so much that I traded my G27 for my G26 (sub compact 9mm). A G19 (compact 9mm) is going to be my next handgun. All my current Glock's are Gen 3 models as all my new ones will be.
Good luck, NYH1.