If I were to aim for say a D90 (or higher) then a D70s or D80 at the right price would be attractive, however, the D80 is so close to the D90 that moving up may not give much advantage (The D80 is very good itself). Moving from a D70(s) would give a worthwhile advance.
Remember that within a year the value of these will drop considerably and part exchanging is largely a thing of the past. In a year or two, when the D90 has been superseded its value will drop and plenty will become available on the market.
A great deal depends upon what you want to do with the images. For my club level photography, 6M pixel uncropped can be just pushed to make almost decent prints at 15 x10 (courtesy of Boots). This equates to an image print density of 200dpi (did I mention that high quality magazine images are done at 300dpi).
For web based images and projected images on a digital projector, 1024 x 768 is a big image and is way less that one sixth of the pixels within a 6M image.
I expect that birders will not often fill their image with the subject, so heavy cropping of the full image will be the norm. This may mean that birders, more than any other photographic group actually do need bigger images.
Sorry to ramble......
Oh, and there is already a D100, it's now old and was/is the pro version of the D70.
Dave..
Last edited by Dave H; 24-04-09 at 08:30 AM.
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