DrJ, your Glock will spoil you for anything else!
I enjoy shooting all of my pistols, but the Glock always feels like "coming home." It fits. It works. It's reliable. It's simplicity personified.
Two bits of advice: At least for your G27, you might want to get the mag extender for it -- not only do you get another round, but you have a place for your pinky, and thus a better grip. (I don't know about the G30.)
Also -- my boyfriend got the night sights on his, and I didn't, and I should have. Get 'em.