As I stated I can't legally carry, legally. So, my range gun needs to be somewhat light and compact.If the Cz is a great buy I would get it. Glocks are very common and you will likely be able to find a good buy on a G19 later if you still want one.
If it is a range gun I would not worry about extra weight. For a range gun I often like a bigger/heavier pistol, they are easier to shoot well, although a G19 is pretty easy to shoot as well.
I wish I could say the same, but I have had three differant Glocks fail in my hand.