Those indeed are the articles I've been referring to to find interesting cards. According to the one article and the PSA population reports the M cap is a rarer card in high condition.
http://www.psacard.com/Cardfacts/Ite...baseball-cards
http://www.psacard.com/Cardfacts/Ite...baseball-cards
Hopefully once I get a few things graded I can get a better feel for what most things will grade at.