I have a beretta 92g (9mm) and a gsg 1911 (22lr) for now. Since your setup is almost the same as mine (full metal 9mm pistol and a nice little 22)
Here's is my future "shopping list" :
-A sweet little polymer gun in 9mm, for bigger caliber i prefer metal gun to manage the recoil. (Im not a glock guy so i would go for a S&W Mp9 or Walther PPQ)
-A kickass and so-funny-to-shoot .38/.357 mag Revolver (If you can get your hands on a colt python... Or a nice little S&W 686 - 6" barrel)
-One day i'll get a nice Kimber or Colt 1911 in .45 (or a H&k Socom MK23 there is one to sell in my LGS for +\-2200$
-I love these Sig P226/229 ... And also these H&k usp...
-You already have that CZ75 shadow so thats a really nice start

-My next purchase will be a tokarev Tt-33 in 7.62x25... Cheap and more funny to shoot than these 22lr... Ammo are really cheap too.
The thing is... You always want another one... You look at these pictures threads and then... You say: Oh my god i need one like this!!!
Damn you CGN!!!!! Hahahaha