Ray,
This is a slow pitch softball pitch for many guys on this board

Even my humble collection would represent a solid answer to your question.
I set out to get *multiple* contemporary (playing-years) cards of every HOF elected major league player whose career was primarily post-1900. This goal was met earlier this year when I got my second Babe Ruth. I had at least one of each guy as of a few years back.
This broad criteria means that this way, I don't have to collect all of the 19th century players. I have a few, I love them, and I will eventually try getting more. I don't have to collect the negro league players whose cards are extremely scarce and for some of them impossible. I don't have to collect executives , umpires or non-playing managers if I don't want to either

Of course if the opportunity arises, I'll buy cards of those gentlemen with pleasure!!
I have about 250 of my favorite ones slabbed by SGC, the link to my registry is in my signature line. I have at least another 400-500 more, some encroaching into the modern era, not slabbed. I've got a lot of slabbing to do!
Anyway, to me..Hall of Fame collecting is my true passion. I enjoy the stories of Bill Bergen, Harry Krause & Mark Koenig, but gimme the Babe, Rajah, Nap & Matty any day!