>>WOW! I have been considering getting rid of the D80 and >getting the D90. After looking at the specs on the D5000, it >is a pretty amazing package for the price. The only drawback >is the sync speed and the lack of a wireless commander mode, >but I do have the SB-800s to act as the commander. … The >D5000 looks to be a step or two ahead of my current D80, >small, light, many, many features.
I'd be really careful about considering the D5000 as a step or two ahead of the D80. Depending on how you use your D80, you might find yourself missing a heck of a lot of features, not ones in terms of the quality of the pix that come out, but rather in terms of what it feels like when you use it.
The two viewfinders show approximately the same amount of the scene (95%), but the D5000's viewfinder is smaller. I think .78x viewfinder magnification would be quite a step down from .94x.
The D5000 only has one command dial. If you're used to using both the main and sub command dials on your D80, you'll find yourself digging into the menu more often than you're used to, and possibly changing settings far less often or missing a lot of shots as you do.
No built-in motor means your 50mm f/1.8 and your 70-300G lenses won't work. The 50mm f/1.4 AF-S and the 70-300 VR aren't cheap, as replacements go; or you could buy a Katz Eye focusing screen (when they come out; don't hold your breath! this is a brand new body, not an old body with new innards like the D60 was), and learn manual focus. Or not use those lenses on your D5000 — shame, those are nice lenses.
The D80/D90's battery appears to last for approximately 70% more shots. That's a lot of extra shots before you have to recharge or replace.
Lastly, small isn't necessarily better. Depending on the size of your hands, you might find that the D5000 is just too small for comfort! Especially if you're used to a D80.
And those are just the spec differences that would get on my nerves. You might have other issues that you care about.
For a huge oversimplification, I'd think of the D5000 as a D60 + Live View, movies, and lots of other great goodies, while the D90 is a D80 + Live View, movies, and lots of other great goodies. In lots of ways, if you use that old SAT style of comparing things:
D60 : D5000 = D80 : D90,
not, as you seem to be thinking,
D60 : D90 = D80 : D5000.
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