My addition today hearkens back to the vintage days even though it's a new insert. The 1985 Topps Chrome RC set features 40 cards found every 1:6 packs (so you'll get 4 of these cards per box). The set checklist includes guys like Beckham and Jeremy Hill so all the top rookies are represented. The improvement over the real 1985 set is that the chrome stock is not very prone to damage or chipping so the black border that was an issue in the real 1985 set is not a problem at all for these cards. You can also pull these refractor parallels. Additionally hobby boxes offer the chance for the elusive superfractor versions:
REFRACTOR PARALLEL CARDS: Base Refractor #/99, Gold Refactor #/75, Pulsar Refractor Die-Cut #/50, SuperFractor 1/1 (Hobby) (from Cardboard Connection.com)
These cards are a great additional set to chase from what is my favorite product of the year. Right now it's pretty easy to purchase the full set online; expect to pay around 15.00 to 20.00 based on past sales.