I tend to have similar tastes as Tallball, I guess we're the same generation
Here are some things I have, that I figure should be a "must have" if you are collecting...
9mm:
CZ 75 pre B
Beretta 92FS
High Power (I have a FEG clone)
Sig P226 (have an old WG).
S&W M39
a 1911 in 45acp, in USGI configuration (I have several, "bargain brand".) A Colt or Remington Rand surplus would be ideal, especially if unmodified.
A High Standard 22lr (I have a Sport King), a Ruger Mk series (I have a Mk II).
There are others I don't have (a S&W police issue revolver in 38 Special, etc). Depending on the direction you veer off, others become must-haves; I have an EG Makarov and other guns in that caliber from the Cold War, as well as a Tokarev.
I like metal-frame duty 9mms, so I also have a Star 30M, Daewoo DP 51, Star BM, Star Modelo Super etc. Would love to hunt down a Luger, an HK P7, some others.