Yeah well, in my fantasies I'm 180lbs of muscle, look like Brad Pitt and shoot like Bob Munden. Wouldn't want anybody to interrupt me with the truth while I was daydreamin'!
To answer the original question, the romantic in me would want an 1860 Richards-Mason or Transition model cartridge conversion .44Colt and probably an 1873 Winchester .44-40 or maybe a `66. Or maybe I'd want a true rifle and tote a big `76 .50-95 in my scabbard.
The realist in me says that my life depends on these guns and would want a 4¾" Single Action Army and Winchester `92 for state of the art weaponry. Both in .44-40, or an `86 instead.