Nunu and Caitlyn have no form of sustain so an equally aggressive lane like Ezreal+Blitz or Ezreal+Taric can work out pretty well given that you have better CC.
I especially recommend Ez + Taric due to the free bonus armor (taking away much of the damage) and the sustain.
Another decent combo is, as aforementioned, Soraka since she has a high range silence + nuke as well as good heals.
Aggressive early game champions like Miss Fortune, Corki, or Graves is pretty good.
Otherwise, Nunu Vayne can just stall the lane and pwn later on.