I used to collect only post-WW2 cards for sets that I was working on (Topps from 52-79, and OPC from 65-69). Just over a year ago, I purchased a T206 Isbell at a local card shop, and became hooked on pre-war cards.
I decided on building a type set for my favorite team (Chicago Amer.); I'm 43 cards into it right now and I'm having a blast!
Unfortunately, I couldn't stop at having just one card from a few sets...so now I'm trying to put together a few team sets (T205 and T206) with each card having a different back. So far, I have 5 T205's and 16 T206's.
I'm just afraid that I won't be able to stop there, and I'll eventually try to assemble T205 and T206 team super sets...