Jules,
You have this warped perception of reality that objects with a
higher price tag are always better; guess that's why marketing is
so successful these days. A first rate Measurebator. Your first
mistake is that the word "better" is very hard to define, what's
better for you is not always better for everyone. Case in point,
your much praised D2x. I
personally would not own a D2x unless
you gave me one, not interested, sorry. High ISO noise is not
acceptable and it's a DX camera. In no way would I pay 5 grand for
a stinkin' DX camera. Remember, that's my opinion only. In this
case, the D200 would be a better camera because it's cheaper and
will satisfy 98% of what I'd need until such time as Nikon brings
us a FF DSLR at which time, any DX camera I own goes out the
window. Good riddance.
Concerning the D50, despite what you proclaim, almost every review
of the D50 and D70 rate them very close. If you'd close your trap
and read the reviews posted here, and actually look at the images,
you'd see that the IQ between these two cameras is essentially the
same. Also, the D50 does indeed have a wider dynamic range and has
better high ISO noise. Surely this can't be possible, it's a
cheaper camera right? Wrong, it's a newer camera with a more
advanced image processor. You think Nikon just sits around
twiddling their thumbs? Nope, they improved upon the D70's IQ and
reduced the price. The D80 may just have better IQ than the D200
when it arrives, so what! Sorry if that's a bitter pill to swallow,
but that's life, Suck it up buttercup. Actually, there again,
despite the D50's lower noise and higher dynamic range, the D70 is
still an excellent camera that will produce excellent images that
you or I would be hard pressed to tell from those of a D50, or
Rebel XT or D200 etc. etc. etc.
Perhaps you may want to read this, "Why your camera does not
matter". Enjoy.
http://www.kenrockwell.com/tech/notcamera.htm