Thanks for all the responses so far. I'm still undecided.
FWIW - I own a very mintish, and what I consider, very comprehensive V system - 501CM body with PME51 meter prism, plus the CFV "chimney stack" viewfinder, the original CFV (16 mpix) DB, Zeiss CF 40, 60, 100, 180, and 250 lenses, plus a few miscellaneous items, including two current style A-12 film backs. February, 2012 will mark the 40th anniversary of my relationship with Hasselblad. Seems like a fitting time to make a lasting financial move!! The CFV 39/50 DB would certainly be the cherry on top of a considerable amount of V equipment over the years. However, I have issues with using a "645" type back on a "square" camera. It just doesn't seem right to turn a V body sideways to shoot vertical, and downright difficult with a 45 degree viewfinder. It just ain't natural. Plus, I recently had to have the 250 lens serviced by David Odess for a broken aperture spring. This made me consider that all my V equipment may be coming of age where it will no longer be reliable, and parts may be harder to find. So these things weigh heavy on my mind when considering a major investment, like a CFV 39/50 DB, in an older, out-of-date system.
But I can certainly see where the H4D-40 without a modern lens might not be the better investment either. If I could afford one lens with the H4D-40 (specifically the 35-90 zoom), I would go the "H" route. It would be nice in the field to travel with one body and one lens. And while this camera/lens combo is no featherweight, it has to weigh less than what I'm currently carrying on my back. Perhaps I'll win the lottery...
Again, thanks to all who replied. Your opinions are appreciated, and all worth considering.