I think they are worth about the same on the used market, plus or minus a few. The D70 is a much more serious camera, but quite a bit larger and heavier, and older, with a noisier CCD according to Roger Clark's measurements. Also I have a lot of manual focus Nikkor lenses which won't meter on either the D70 or the D40. They will meter on the D200 and D300, which are out of my price range new. But now that the D300 is out, used D200's are becoming affordable. So I'm thinking of buying a used D200.
The D200, on the other hand, is larger than the D70 which is already near the limit of what I can conveniently carry very often. Add the MB-D200 battery pack to run it on AA's (I hate lithium ion) and it's even bigger. So I think if I got a D200, I'd use it mostly for those occasions that needed MF lenses, remote flash, etc, or for shooting at home (which I do a fair amount). That leaves me wanting a smaller camera, and my Canon A530 P/S recently crapped out (built-in flash stopped working).
So an upward trade (sell D70, buy D200) doesn't really work, it leaves me with a cumbersome camera. Instead I'm thinking of buying a D200 and trading/cross-grading the D70 for a D40, which is very small for a DSLR though of limited capability. The limitations are less of a problem since I'd have a D200 available. What I really want is a hypothetical D400 with a full frame sensor (priced about like the current D300, i.e. a little bit below the directly competing Canon 5D), and I figure I'll buy it when it happens since it's the last digicam I'll ever want (hah!), but I figure that's at least a year away.
Let me know if this sounds nuts.
The D200, on the other hand, is larger than the D70 which is already near the limit of what I can conveniently carry very often. Add the MB-D200 battery pack to run it on AA's (I hate lithium ion) and it's even bigger. So I think if I got a D200, I'd use it mostly for those occasions that needed MF lenses, remote flash, etc, or for shooting at home (which I do a fair amount). That leaves me wanting a smaller camera, and my Canon A530 P/S recently crapped out (built-in flash stopped working).
So an upward trade (sell D70, buy D200) doesn't really work, it leaves me with a cumbersome camera. Instead I'm thinking of buying a D200 and trading/cross-grading the D70 for a D40, which is very small for a DSLR though of limited capability. The limitations are less of a problem since I'd have a D200 available. What I really want is a hypothetical D400 with a full frame sensor (priced about like the current D300, i.e. a little bit below the directly competing Canon 5D), and I figure I'll buy it when it happens since it's the last digicam I'll ever want (hah!), but I figure that's at least a year away.
Let me know if this sounds nuts.