The fear is that +P ammo will make a glock go kaboom
Rest assured it won't. Both my friends shoot +p out of their glocks.
I also own a Glock 19, I've fired two types of SD ammo out of it. 115 grain Magtech Guardian Gold and Gold Dot 124 grain. (which is what I currently use)
I would recommend the gold dot ammo, it mushrooms beautifully, look at what it did to this watermelon I shot.
As for the grain, I've been told 115 grain works best in sub-compact, 124 grain in compact, and 147 grain in full-size.