Joseph Your reply addresses my question. The fact that both will do what I need, helps my decision process. The D400, if it appears, will be out of the question. Cost is a factor in my decision.
This afternoon I looked at a D200 and a D300. Of the two, the D200 would definitely be the better choice; it is in much better condition. Both meet my original criteria, though I realize the D300 is the more advanced model. I will consider everyone's comments and hope to decide in a few days.