My first handgun was Glock 19. so was my 2nd one, Glock 26. Just can't get enough of Glock. My next Glock will be G23. If i were you, get Glock 23 (0.40 caliber) then u can just buy a conversion barrel (9mm) in the future. So u can have both caliber worlds in one gun.
And if u decided to get Glock, register for 2years membership at gssfonline.com. By doing that you will get a coupon which you can purchase a brand new Glock at LEO price.
Back to yourself, get the gun you are comfortable with.