I looked at Thom Hogan's reviews of the D7000, the D3200, and the 18-200 mm zoom lens.
He points out that the D3200 at 24 Mpx has even higher resolution than the D7000. In addition, he says that my 18-200 mm lens strains already at 16 Mpx. So it seems to me, if i accept what he says, that if I consider getting anything, I should consider getting a FX body with at least 16 Mpx and a FX capable lens that can make adequate use of it. But that would cost me more than I am willing to spend on a DSLR at present. Should I, at some point, decide that using a view camera is beyond my physical capability, it might make sense to consider upgrading to an FX format camera and lens, but otherwise I should just stick with my D90, at least for the present.
As Groucho Marx said, old age ain't for sissies. At 79, I am beginning to feel it.
Leonard Evens Professor Emeritus, Department of Mathematics, Northwestern University