I recommend the following. You can go trial it using lens rental to prove my point.
1) 1x D7000
2) 1x Nikon 10.5 FE
3) 1x Nikon 17-55 f/2.8
4) 1x DxO 6 S/W
DxO will be able to undistorted if not all, most of the Nikon lens even if it has wavy lens distortion, not just simple pincushion or barrel distortion. Using DxO, FE can be unwrapped into very wide angle with stretches at the side. All UWA have it, so it's not surprising FE gives more, but human eyes are not too concern conceptually unless you are trying to measure things.
All of the above has trial and rental to allow you try it out before committing.
As for your Dynamic Range, I am not sure what kind of Dynamic-ness you are looking out for. It is really that subtle that even D7000 cannot resolve it ? I am pretty skeptical about it. The top end Hasselblad will set you back in range of 20K or even more, obviously for your usage it's way over the head. If dynamic range is really an issue, perhaps Photomatix can help ? Again you can trial on it too.
I am pretty confident your problem is totally resolvable with both adequate software and hardware combination. It doesn't require you to go into the MF range unless you wanna see texture on a art painting ?