He'd look good here, for sure, but I think he'll go to San Antonio. He can start there, would be perfect next to Duncan, and with RJ, Parker, and Manu, they might well be the favorites.
I think I might actually prefer Marion anyway, as he can back up both Pierce and KG. I'd love another long big, but Baby is surprisingly effective against the behemoths out there, so retaining him would soften the blow. Seems like Sheed's fallen off a bit in the last couple of years, but either one would be a great get.