D70 and Sigma 8 might be a good idea. I would also wait for PW4.
If Nikon doesn't come out with something bigger and better, we will probably move from our 990/fc-e8 to the D70/Sigma 8, or the Canon 20D and Sigma 8.
See Sams specatular work done with the Canon 10D /Sigma 8.
Then be sure to see James Yang's Canon 10D and Sigma 8 image stitched with PW4.
Then click below each to see full screen version.
Each photographer has a small narrative about their camera and lens and stitching software.
I understand from others the FC-E9 is a bit fuzzy and not as good as FC-E8.
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EasyPano - Panoweaver