With the question being who has the best chance, the answer has to be somebody. Earlier in the year I would have said Austin Hollins if he could add some weight to his frame that he could become an NBA role player as a defender capable of guarding 1's, 2's, and possibly some 3's. Unfortunately, Austin's defense did not take another step this year and he's not a stopper at the B1G level, so projecting him to the NBA is a real long shot.
When looking at who can play in the NBA, you should look for guys who have a skill that could translate to the NBA-a guy that could fill a specific role. For that reason, I'd say Eliason currently has the best chance of playing in the NBA given his "skill" of being at/near 7'0. For Eliason to make the league, he'd have to take a leap from an athletic standpoint between now and whenever he played a game in the NBA. Eliason would never be a scorer, but if he could play smart defense and became athletic enough to block/alter shots of NBA athletes, then it's possible he could find a role as a deep bench player somewhere.
We really badly need to start developing some NBA players again. I know someone in this thread suggested Voshon Lenard was a poor defender, but he actually was quite solid on defense playing for Pat Riley's Miami Heat during the 90's. It's too bad that right now our only NBA player is Kris Humphries. That's part of the reason I badly wanted Rashad Vaughn. Even if he only stayed one year, adding a first draft pick (assuming he wouldn't come out if he was going in the 2nd) and having it be a Minnesota kid would be a selling point for the program going forward.