I would like to re-sign Baynes, as he brings solid interior defense and toughness.
I was thinking about this last night, but why not go after JJ Reddick? I think you could make a reasonable sales pitch to him to come off the bench for a championship caliber team. He will be 34 next month, so I'm not certain that he will necessarily be holding out to be a starter.
I would also like to see them extend Smart, but at a reasonable price.
I don't know the Celtics cap flexibility, but that would be my wish list.