Just to weigh in...
1. Popularity - I believe if you go with popularity you'll have Mantle, Clemente, Williams, Ruth, Gehrig, Cobb, etc.
2. Price (accessibility to the average collector) - then you'll have great players such as Willie Mays, Frank Robinson, Aaron, Bench, B. Robby, etc.
3. Any other pertinent factors - personally I don't take into consideration resale, so I would collect who my favorite all time player is. If you do this you'll never get tired of who you collect even if you take breaks from collecting.
Like others have said you'll learn all about other items that are out there of the player you're collecting. I thought when I started single player collecting that it wouldn't take me to long to get everything, but found out relatively quick that I'll "never" have everything (and that was before all the 1/1 and #'d cards).
It looks like you're a Braves fan so I'd go with Aaron, Sphan, Matthews, Jones, Murphy or one of their great pitchers.
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