I would use this lens primarily with my film cameras, though I wouldn't shy from mounting them on the D90. With the 1.5 crop factor, the range is nothing to scoff at - 42-157mm with the Nikon and 36-203 with the Tamron. It's tough, the more I think the less I know what to do - both are good, Tamron has the range, Nikon has the macro.
I have the feeling this will end with one of them popping up at a price I won't be able to ignore. In fact, I was "this" close to getting the Tamron for $125 shipping included but hesitated long enough that it disappeared. Lesson learned.