I have the G-27. Nice pistol. Be sure to get some nice night sights to go on it. The little plastic front sight Glock puts on their pistols is a joke. That is my only gripe with Glock. Please make sure your carry holster covers the trigger. Don't want you to end up like that inept DEA agent that shoot himself!
I personally like the lighter bullet weights for the .40. Especially in the G-27. It can be a handful when shooting hot heavy rounds.
Good choice - Have fun!