Gee, I'd love to help you spend money. What're we getting?
Oh, wait, you just wanted advice. Well, can't go wrong with a G19. Personally, if it were me, and I had as many Glocks as you have, I'd go for something totally different. A vintage Colt revolver maybe, or a "black" rifle while you still can. An old S&W wheelgun can be awesome too. A good quality .22 target rifle and/or pistol is pretty much a staple everyone should have.
I don't understand why people buy so many Glocks. They're generally reliable, simple, easy to maintain - in other words amazingly functional. Every shooter should have one, maybe two. But they're historically and mechanically boring. Having some variety is good too!