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runscott...since my response differs from that of others, but here it is anyway. The following were the only ones that gave me trouble - in fact, I owned most of the rest in weak condition and was even able to upgrade via ebay and friends. When I find Mack or Lajoie, they are always overpriced for the condition - Lajoie shows up more often. I don't recall ever seeing a Tinker, so I would say he's the most difficult. My Clarke was trashed, but cheap 
and I must say..."Brown is Beautiful"
Very difficult: Tinker,Kling,Mack
Difficult: Brown,Clarke,Lajoie