The Dragonfly, particularly the s/s model, is the most elegant knife in Spyderco's line IMO.
It's ergos are great, but not as good as the Pegasus.
The Co Pilot was the first small knife with the intention of airline carry.
It's a nice knife, but again, the ergos of the Pegasus are superior.
I'd go for either the Dragonfly or Pegasus, depending whether style or ergonomics turn you on.
Later, Bill