Thanks for the tips guys. I will be doing a lot of landscape time lapses (night sky, sunsets, etc), so i'm looking for an appropriate lens for that.
OK, here is a solid suggestion that would work (low light conditions and expansive field of view): a constant f/2.8 wide angle zoom. Nikon 14-25 f/2.8 AFS is a top of the line example. It's certainly not the only choice, but it's one that will work.
Any of the current crop of fast prime (non zoom) lenses will also work fine. A good, but not cheap, example is Nikon 24 mm f/1.4, this lens is not very wide on a crop sensor camera.
As for your question about the utility of kit 18-55 (or 18-70) zoom lenses; these are ok for the most part but usually don't shine at anything.
They have variable maximum apertures which is a pain when exposure is critical.
They are slow (rather small max aperture) which does not help at low light levels.
They can be rather soft at the extremes of their focal range.
They can also be a bit soft when wide open, where you will be a lot of time with these slower lenses.
They are built to a price point which can lead to some rather fragile pieces of kit.
The focal range is for the most part centered on the 'normal' focal length for the accompanying sensor, many photographers find this range a bit boring after a while. Other than 'event' photographers which can be argued have an absolute need for a high quality mid range zoom, a lot tend to get a really good wide zoom, a really good long zoom, and the best normal prime they can find.