Hibbert is too slow to play in today's NBA as a full time, especially with big men like Horford, KG, Dwight, Amare. He will be a serviceable back up at best.
A sleeper pick is Brook Lopez, 7 foot athletic big man who can defend, rebound and shoot, very well rounded big man and very strong at 260 lbs, he's still growing into his game; has a lot of room for improvement and excellent work ethic to get him to his full potential. He worked really hard to recover from his back surgery and is looking to lead Stanford through the Pac-10.
The best draft site is draftexpress. NBADraft.net seem to have Isiahsexual like prediction ability, so never trust those guys with player projections.