BTW, what software do you use? Also have you thought of having a softening filter on your camera. Some will just take away a touch of the documentary harshness of over-definition from the excellent Nikon lens.
I use Photoshop 6 at home; cs4 design suite at work. I believe the cs4 license will let me put it on a computer at home, but I've been waiting for a new computer, which I just ordered a few minutes ago.
I've never considered a softening filter. Coming from a newspaper background, I think I've been seeking the "documentary harshness."
I do have the accessory lens holder, and also a multicoated filter that goes onto it. Maybe it's a B&W UV filter. I got that primarily so I could leave the camera on my car seat and allow it to go to "sleep" and not worry about things getting into the lens mechanism. I have the wc-e68 accessory too, which produces a wonderful wide angle view. There's a touch of distortion, but it's a very simple distortion. I guess the point of that is it would be easy to smudge the filter!
Here's one with the CP 5000 and the wc-e68, unedited. It's Frank Lloyd Wrights Marin County Civic Center:
Bob Rogers: Marin County Civic Center
Architect: Frank Lloyd Wright
Enjoy,
Bob