I have also been focusing on
Mercury dimes for quite some time. I have all but 38s, 21, 21d, 16d in an album(No Variations 42/1 or micro s either). I fear I won't be doing the banana dance for awhile on that one though. Even if I buy the 16d in the future, I doubt it will ever slum it with the other dates in my album....
Roosevelts should be fun and alot easier, especially since I am going for the old dansco 46-68