I'd love something as powerful as a D2 1000 or Broncolor Siros (800 w/s) that runs off batteries. I often that the B10 Plus just doesn't have the grunt I need when trying to get nice diffusion on location. Maybe the new D3 with a battery would be possible?
One monohead to rule them all. Same heavy duty form factor with the pro-quality back handle, knob, and stand spigot. 1000 w/s, and can be used with either a high capacity battery, or true AC power. All flash specs equal to or better than the current B1X or D2. This would be THE light for me.