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From my experience in building a front set of T205s:

Last card: Young (wasn't hard to find, but I had several kind of slip through my fingers)
Most expensive card: Wilhelm
Toughest card: There isn't really anything truly difficult unless you are building the back set, but there are several cards that are incredibly easy and several that are a little tough...I think the one that was tougher than its reputation for me was the Crandall t crossed. Dahlen and Walsh are comparatively tough...Collins and Bresnahan mouth open seemed tough to me as well. Magee was the unaccountably tough card that was not a variation or SP.

Joss is fairly tough, but more expensive just because of its unusual nature.

A few cards like Chance, Huggins, Evans, Oakes, etc are VERY easy and you see them at a significantly greater rate than others.

My set is very low grade and I got a good start that included some SPs so my take may not be accurate in some circumstances.