Make sure to choose an electric with a DB-like bridge, fingerboard and general setup. For instance, I love my NS NXT 5, but I don't think of it as an electric DB at all - it sounds like a fretless electric and you can't use the DB plucking style on it due to the shape and size of the neck and bridge. You can, however, bow it all right.
Portability and the huge saving in size in any electric upright are a fantastic bonus, though.