I bought a glock 26 two months ago and now I am considering a bigger caliber to pair with it. I really like the glock 30, not sure about the glock 23, is there a huge difference between 9mm and .40 rounds? I am also interested in the glock 29 but I am not very familiar with the 10mm round. What does the 10mm round compare to? Should I just stay with 9mm and get the glock 19. I could really use some input please, thanks.