It would help to know what you're looking for in a collection. For example, when I started collecting I wanted to get an example of different guns from different categories. Initially I wanted at least one each of a...
- medium/full size .357 double action revolver
- hi capacity 9mm/.40S&W modern combat gun
- 1911
- .22lr automatic
- pocket gun
- single action cowboy revolver
...and there were more, but you get the idea. If you develop a "theme" to your collection, then you'll have a better idea for what to look for in your next purchase.
--Richard