For Cyber my choice would be 19th Silent, the Surveiler or Reavers. Mostly because (outside of Excelsior's Surveiler) none ever saw a model, the Reavers never even had proper art (a single headshot of a named Reaver). Any one of them tops my list of most wanted Cybertronic units.
For Bauhaus I would have to say Order of the Wolf, Blitzers (done up in the old 1st Edition heavily armoured style with a proper Firefist missile launcher) or the Ulfwerner. The first, because Romanov is my house of choice, the second because I love the background of the Blitzers (the misfits of tank-loving Bauhaus society) and the last because it looks bad arse.
Truth be told, I would be paralyzed by choice.