Unfortunately, high end scanners are a bit of a dead-end technology.
Flatbed scanners have always been a less than great solution for scanning film-there are too many glass-to-air surfaces and it's hard to optimize the optics for two different scanning distance. Those of us who shoot larger formats tolerate them because there's enough resolution in the film to mask their deficiencies somewhat and alternatives like the Coolscan 8000/9000 have been $$$(I have an 8000 on Lay-a-way, and once I get it paid off my V700 will not touch another medium format negative-I already do 35mm exclusively on a Coolscan V).
Although I haven't experimented with it personally, DSLR "scanning" of 35mm is getting really popular, and with 36mp+ cameras can give results as good as a scanner
Unfortunately, of the available sub-$1K scanners, I think the V800 is probably the best of the lot. An Imacon, Flextite, or Hasselblad won't do any better for flats, and a dedicated Nikon film scanner(preferably a Coolscan V/5000) will do better for your transparencies. Of course, the downside to the Nikons is that they really do best with the Nikon software and it will not run on an OS newer than Snow Leopard.