D50 is better than D70 for birds. It's ccd will give less noises at high ISO. You need high speed for birds as birds are active early in the morning and late afternoon. Maximum usable ISO for D70 maybe ISO400 while D50 could be use at ISO1600. It's because of the newer technology of the D50. Just like newer and cheaper pc are always better than older and more expensive models.
I use a D50 and VR80-400 handheld for birds and am very happy with it. I shot more than 5,000 photos in six months. For macro I use MicroNikkor 60mm and it works very well. Why buy camera with more functions than you need? New models will come out every 6 months and they will be better and less expensive. I used to taking bird pictures with Leica IIIf rangefinder camera. Today DSLRs are much more convenient. I do not believe that the top Nikon model will take better photos than the D50. Manufacturers like to use the words 'novice' and 'pro' to make extra profit!
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