As others have said, I think Thomas would be better than Smith. However, either would work. I'm not incredibly worried about who we get there. Perk will be back at some point, and we don't really need him to be himself until even the 2nd round of the playoffs. Until then, while I hope for better, we could win 50+ games with Mikki Moore as our 4th big.
And before people start going off about KG's health, it doesn't matter who we have on the bench if KG goes down, because we're not going to win a title without him.