I'd make the trade. LBJ is playing better as the season progresses. I disagree with the previous post about the TOs. First off, both LBJ and Amare are averaging the same amount of TOs. Also, most of LBJ's TOs happened in the beginning of the season while he was getting used to his new teammates. On the other hand, Amare has increased in TOs as the season progresses.
Even if you are in a two center league, I'd still make the trade because LBJ is a great trade bait.