Sure, the D100 is a nice camera (I can't believe I just typed that in an "all analog" forum), but...

The first time you want the look of Tri-X in Rodinal, you'll be back in a store buying a film body when you discover that digital won't do it.

Having said that, is keeping what you have and adding to the arsenal an financial option? Have you actually used a Hassey yet, or are you basing the decision on marketing information? If you haven't shot with one, I'd suggest a rental for a weekend and a couple of pro-packs of film. There are other MF fish in the sea...