Complete/Near Set Builders- Toughest Card?

[Tim Kindler]

Attention those who have completed sets or are near completion of a set! Seeing Ed's T206 Completion Thread got me thinking about a couple of things that might interest those of us who are starting towards or near completion of various sets:
1. What was the MOST DIFFICULT card that you came across in completion of your set?
2. What was the MOST EXPENSIVE card that you purchased towards your set.

Please list the set and the answers to questions #1 and #2.

I've listed some of the more popular sets below, but please feel free to INCLUDE any set that you have completed or are near completing. I think this thread can be especially valuable to the many new vintage collectors joining the forum lately or those of us like myself who are thinking about going towards the next goal in our collections.

Example sets: T205, T206 (Excluding the Big 4- Wagner, Plank, Magie, Doyle), T207, E93, E94, E95, E96, E97, E98, E101, E102, E103, E106, M101-4-5, N28, N29, M116, D304, T3, T200, T201, T202, 33-34 Goudey, etc.

Can't wait to see some of your answers.

I'll start out:
SET- E98
MOST DIFFICULT-Bill Dahlen
MOST EXPENSIVE- Ty Cobb