I agree w/ all that have responded, many great ideas. Except the 18-200. I've reviewed many, many images and decided against it personally (for me).
Reasons are simple: sharpness, zoom speed, aperture, and most of all the hard bokeh. I love the butter soft look of high quality glass getting that dissolved background. No PP can replicate it.
Ultra-wide is indispensable on a 1.5x crop D80:
Tokina 12-24 f/4. I shoot landscape, interior architecture, and just used for a huge car show this weekend. Nothing replaces ultra wide when you need it.
Walkaround, I love my copy it on my D80 75% of the time:
Sigma 24-70 constant f/2.8:
Macro, this Tokina is worth finding, even though MF and 20+ years old:
Tokina 90mm f/2.5 Macro
If you haven't seen, this link SELLS this lens:
http://forums.dpreview.com/forums/read.asp?forum=1034&message=15320425
I'd opt to spend the majority of money on a serious zoom, like the Sigma 100-300mm f/4 or Nikon 200-400 f/4 VR. Nothing beats long, fast glass if you can afford it. I can't afford the 200-400 VR f/4, and is the LEAST likely lens to ever use for my work, so I've got a Sigma 135-400 f/4.5-5.6 from KEH for $325 is EX+ condition.
That's it.
- Tokina 12-24 f/4
- Sigma 24-70 f/2.8
- Tokina 90 f/2.5 macro
- Sigma 100-300 f/4 OR Nikon 200-400 f/4
I've got a 50 f/1.8 AF and hardly use it, but is BEST for portraits. I like fast zooms for a little versatility in framing. Your opinion may vary. Also, I was lucky enough to pick up 5 MF fast primes for free with my Tokina 90mm. Still, prefer zooms.
And I've got the 24-120 and always want to change it off my D80 whenever I put it on, just not sharp enough, not fast enough, bokeh is 'contrasty' sometimes. It stays on my N80 as a great versatile range from true 24mm to 120mm as a film dSLR.
Maybe this helps? Others may disagree w/ my choices, but that's why forums exist, right? Cheers.
David
my flickr:
http://www.flickr.com/photos/prodesma/