My current GLOCK stable is G17, G23, G30, G21, and will be adding a G19 soon. I am now considering consolidation, for more commonality of mags, ammo, and parts. Currently ccw the G23, can replace that with the G19 (same holsters). My thoughts right now are possibly trading the G23 and the G30 for another G21 (my fave, and as they say "one is none, two is one"), and more 9mm GLOCKs. Do you prefer consolidation or variety, and why?