What lens to get for Sony NEX-C3?

I'm considering a NEX-C3 as a second camera (to my d5100 with twin kit lens) and I was wondering whether I should get the 16mm pancake or the 18-55mm? I will be using it when I go some places where carrying a dSLR would be quite uncomfortable/unnecessary. Please note that I already have the nikon 18-55mm.

The 16mm lens will be pretty wide!
The NEX-C3 has an APS-C sensor so it will be equivalent to a 24mm on a full frame.
It comes as a kit with both lenses for £70 more than just the 18-55.
If you can afford it I would go for that.

18-200 if you have the money.otherwise 18-55. 16mm is rubish.