I think FIRESTORM could be a star in the DC universe if he got more attention in storylines and joined teams
Hawkman: after Brightest Day I was really hoping for a great series starring him in the New 52. While Savage Hawkman obviously wasn't that series, he steals the scene every time in Justice League of America and given the right writer and artist (how about Jeff Lemire and Nicola Scott), he could definitely carry a solo-title.
All of you misspelled "Plastic Man".
Plus Captain Atom (if they revert him to his pre52 ability set), Blue Beetle (Jaime), Metamorpho (not this girl rip-off on the JL) & Captain Marvel (in his case, they should decide how much they're going to feature, not go back & forth between "a good amount" & "not at all").
@knightfall225: Firestorm's counterpart was shown when the Crime Syndicate recently appeared, so we might see more of him when the JLA fights CS.
I think we need more Cyborg, as he's now one of the founders of the Justice League. And more Black Adam and Captain Marvel.