I am a Zoli guy, but from your choices I like the CG, then the Blaser, then the Beretta, mostly because the cast on the Beretta makes them not fit me.
CG has a reputation for great customer service and while it seems like that should be expected when you spend close to 5k on a shotgun, but oddly that isn't the case.
One of the nice things about Blaser and Zoli is that their US HQ is in San Antonio, makes it nice for us Texans to drop by and have something looked at by the "manufacturer."
I assume given the guns you are looking at, that you know if you go to Nationals you can fire all these guns at the same targets on the same day to see which one is a better fit.
Also, welcome to the addiction. You think this will be the gun that you finish with, it won't be. Give it some time and you will be looking at F3s, Zsports, Hi-Techs, MX2000s, Kolars, DT11s, it never ends.