Hmm, nice problem.
I think I am calling. I think this the right play in this case since the board is rainbow and you have the nuts. The only scare card is a pairing card but I don't think you can chase out a set here. Instead you can keep in the SB who has a potential over pair and boast your pot. Whenever I do something like this I feel a lump at the back of my throat but I think its the right thing. I suspect the player who has come alive may have something like 99 so he is not folding anyway.
Rich