Just been to Nikon USA site, should have gone there first before replying.
The 18-55 is a DX lens so no x1.5 factor - that makes this a seriously wide angle through to standard lens. The high price will be down to an ED element and Hybrid aspherical element and the fact that superwides are of more complex construction. Without looking at the results or even through a viewfinder I would not know how well it has been corrected for verticals. At the edge of the frame there is a tendancy for verticals to be bowed out ( barrel distortion ) on less than pro quality lenses.
The other lens you mention is not DX so my previous posts comments apply.
Don
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