What caliber(s) should I add to my rifle collection?

[CH47gunner]

Marlin 444 - best brush gun I've ever owned.

Bruce

 

[WhoKnows]

257 Roberts is a amazing round (not on paper but in the field its outstanding) or a 1874 Sharps Heavy Target Model Rifle - .45-120 Caliber (Replica from Cabelas)

 

[Patriot-Brewer]

You know, it's almost unamerican not to have some type of M14.

.45-70 and .17HMR are my other two suggestions. (Marlin and CZ)