Phoebe!
Phoebe Caroline as a combo would be gorgeous.
Phoebe has that something special that
Caroline just doesn't have-
Caroline is a lovely classic and all, but
Phoebe has the great meaning, history and *spunk* that
Caroline is lacking. I also think
Caleb and
Phoebe sound much better together than
Caleb and
Caroline.
Either way you can't go too far wrong but go with
Phoebe!