Wed 06-Feb-13 12:27 AM | edited Wed 06-Feb-13 12:29 AM by Drbee
I'm going out on a limb with a bit different kind of suggestion. You do mention landscapes, but you don't mention a tripod. If you don't have one or are used to using one, you might try adding a quality tripod to your kit. A good/versatile one with a quality head and quick change plates can easily set you back 1-1.5K dollars.
I have a nice tripod system and it is in valuable in my photography. However, I also travel a great deal and it's often just not practical to tote a tripod about.
For my landscape photos, especially where I'm not using a tripod, I find the 16-35mm f/4 AFS VR Nikkor very useful. I use it on both DX and FX cameras. If you are possibly heading toward FX, that would be another "vote" for such a lens. The VR capabilities of this lens adds greatly to its utility including extemporaneous landscape images.
This lens does overlap considerably your DX lenses but it adds VR to your mix. I find that very useful for travel, walkabout and general WA photography.
At this time, with your current lenses, I would not get a D700. Your lens lineup just doesn't warrant that choice IMO. BTW: I'll be keeping my D700 as my primary camera for a long time, however my lenses are completely FX. I do have the 17-55mm f/2.8 AFS DX lens that I use on my DX D2Hs and it is a stellar optic. It's also a large lens and one of the reasons that I often use a tripod with my landscape images.
Another side note: if you are using a tripod, you won't find the VR feature that useful.
Roger It's still, ISO, aperture and shutter-speed, right?