Other than a larger sensor what are the real rationalizations for upgrading
to a D80?
The sensor does not appear to have significantly greater dynamic range.
Can't use compact flash cards.
Most of the feature set just seems parallel or minimally different from the
prior generation, especially for RAW shooters who do not shoot multiple
frames per second. And why anyone would primarily shoot jpegs with a dSLR is
something I completely fail to grasp, but that is another rant.
However, the viewing system could just be the deal maker--the D70 is a first
class camera mated to an execrable viewing system. If the D80 pentaprism
yields a brighter, larger image that alone might justify sending the D70 to
the closet graveyard of SLRs . . .