The recently introduced Nikkor AF-S 14-24 f/2.8G ED is being widely heralded as the best ultra wide angle on the market at any cost from any manufacturer. It's so good, many Canon FF users are employing Nikon-to-Canon mount converters just to shoot with this lens. And at around $1,500, it's a pretty good value too.
The 14-24 is reportedly sharp across the range, even wide open, and exhibits limited distortion at 14mm (which can easily be overcome with PTLens or similar in post). It's a tad slower than your 24 f/2 and I'm not sure which body (bodies) was (were) used in testing this lens, so can't say how performance is on the D2x, but it's worth checking out.
Rob O