You need:
K frame Smith & Wesson.
Single action Ruger revolver.
double action auto, either a Beretta 92FS or a CZ.
.45 ACP single stack 1911.
.22 auto.
Then your collection will be acceptable. At that point you move on to making it spectacular.
I recommend: Get an STI .45 ACP. if this is out of your price range, get a ruger single six and enjoy plinking.