It is really hard to say. The problem with baseball cards is their value lies in the hands of those who are on the cardboard. So, if Felix Hernandez becomes the next Pedro Martinez, in a few years you might be able to double what you got it for...or he could become the next Brien Taylor, and you are out 25 bucks. Same with the other guys. It all depends on how they play on the field.
That is why I stopped buying cards and started getting autographs. [not buying autographs on eBay] Autographs also rely on how the players do on the field, but not that much. Plus, you can display them a lot nicer than a few cards. Also, if you get guys that are retired and good, before they go in the hall of fame, there stuff will only go up. Whereas with baseball cards, out of site, out of mind. Just look at Barry Bonds.
[list]Classic Jerry Colmanisms
[*]"Montreal leads Atlanta by three, 5-1."
[*]"They throw Winfield out at second, but he's safe."
[*]"Johnny Grubb slides into second with a standup double."[/list:u]