I'm not sure there truly is centerfield depth, but if the right deal came along for Celestino or Gordon, I wouldn't hesitate. Gordon might actually hurt more given his ability all over the field, but likely has less value. Cave poses an interesting scenario that I wouldn't hesitate to part with, but likely doesn't have a lot of value either.
I'm completely comfortable with Kepler filling in at CF in the short term, but a prolonged Buxton injury may be an issue. If Kepler is dealt, this conversation gets much more complicated.