The biggest thing missing from this team is a solid interior presence. I know Brand has done well this season, but he's only 6'9 and the Sixers lack a true center. I am almost convinced Speights will not live up to his potential and Spencer Hawes is mediocre at best. I was looking at the free agent class for the upcoming season, and I noticed that Greg Oden has not been offered an extension from Portland. I know he's been injured for the majority of his career, but there is no doubting his skills as a rebounder or shot blocker. His offensive game was not impressive, but that will continue to get better as he plays more games (I know, thats a big if). I'm not saying the Sixers should go out and pay a good amount of money for him, but I believe he's definitely worth the risk if he settles for a small contract. Worst case scenario is that we paid small bucks for him, and who knows how good he can be when he's healthy. Other big name centers that will be free agents:

Tyson Chandler

Yao Ming

Marc Gasol (restricted) 

I would love to get Marc Gasol out of the four, but since we spent so much money on Brand and Iggy, I don't think we can afford him.