It really depends on what you want to do with it. For carry, you'll likely want the smaller lighter choices: Glock 26/27 or 19/23 size. The 34 will seem awfully big compared to those two, but for fun put a 34 next to a Commander .45; it might surprise you.
I really like the S&W M&P45, but put it next to the G30, expecially one with a grip reduction -the thing Glock should have done instead of the anemic SF effort, and the G30 starts looking pretty good too. I like to play shooting games as well, but real world carry will do a lot to influence your choices. If I could only keep one Glock, it would... who am I kidding; I'd have to have more than one, if only to keep my PM9 or 340PD or CCO from being lonely.