Which are from the more pragmatic wing? I know Bob Barr freaked out my mother once on a plane and is a well known psychopath.
I'm more familiar with some than others, but my impression is roughly:
Pragmatists: MacBride, Clark, Paul, Marrou, Barr, Johnson
Purists: Hospers, Bergland, Browne, Badnarik
My personal ranking:
1. Gary Johnson (can't argue with the results or qualifications to run)
2. Ron Paul (his LP presidential run was a bit disappointing but he's RON PAUL)
3. Ed Clark (good template for running with broad appeal)
4. Harry Browne (this is the guy who hooked me on libertarianism; a bit radical sometimes but an engaging person)
5. Bob Barr (not a nice guy but he turned in an OK performance and was relatively qualified)
6. Roger MacBride (not exciting but a principled man who did good work to build the liberty movement early)
7. John Hospers (similar to MacBride)
8. Michael Badnarik (a bit of an oddball who was wildly unqualified and would not have been nominated if it wasn't for his amazing LNC debate performance)
9. David Bergland (should not have been the nominee; tanked compared to Clark)
10. Andre Marrou (worst LP campaign by far, I would not have voted for him in the general)