[aljurgela]

If you are in to negro league/latin american cards, the monster is the 1923-24 Tomas Gutierrez set. It has 85 cards. Most subjects have less than 4 graded between PSA and SGC. The most have about 7-8 copies graded. It is super tough and, in fact, there is still one card that is unknown.

SGC recognized the difficulty of this sets' completion by bestowing upon me the best "baseball set" for 2010 while I was still missing a handful of cards.

While money helps, the true difficulty is in finding the cards! At a minimum I would project that this set would take 5+ years to complete at 80% if you started from scratch today.

That is a challenge!