Who are some guest stars that can sway you to buy a book you wouldn't normally buy?
There were certain villains that would appear in books that would interest me. Particularly any villains that were on Challenge of the Super Friends Legion of Doom - Sinestro, Giganta, Riddler, Scarecrow, Cheetah, etc...
I would also pick up DC Comics Presents or Brave And The Bold depending on who was with Superman or Batman. Atom, the Hawks, Captain Comet, Black Canary and Zatanna were favorites.