If you want to save some money ($150) don’t buy the Sony NEX-5 + 16mm annd 18-55mm lens now! A new deal is coming from Sony.
Currently you have to pay $649.99 for the NEX-5 + 16mm combo and add other $299.99 for the 18-5mm lens. That makes $949.
With the new offer which will start very soon you will pay -$150 less for the whole package!
So don’t buy now if you need both lenses, wait!
UPDATE: Sorry, I forgot to say that in Europe and Japan the kit is already available. It was not available in US!