I think I paid $100ish for a reprint set - it was really useful for me with figuring out what I had and what I needed and to be able to recognize cards on sight. I would highly recommend having a reprint set if you are trying to put together the monster. I sorted out all of the Hall of Famers, Southern Leaguers, Minor Leaguers, and Short prints and attacked it that way.
Mine also had a bonus card - Eddie Collins batting that I don't believe was produced in any form aside from proofs (Charlie Sheen owned it, and I want to say that Keith Olberman has it now?). I don't think mine had the Joe Doyle NY Natl.
Here's a link to the Collins -
https://www.t206museum.com/page/ga_proofscollins.html