For the record, I think Big Baby is a significantly better player than Reggie Evans. He does not rebound as well, but he does everything else at a significantly higher level.
With that said, if they can't afford to keep Baby (or just have grown too tired of his act to keep him around), Evans would be on the list of backup options.
I would put him well behind guys like Landry, Martin, Humphries and McRoberts, and probably just below Chuck Hayes (who is similar, but a better defender).
Ultimately though, it is going to come down to money, and I have a feeling Evans is going to be paid a bit more than he is worth, because he puts up such crazy rebounding numbers...and that makes him a relatively unlikely target.