I have to choose the Feldwebel, as the other options look rather garish, and ostentatious. Considering your stature and sheer regency, an understated look is, in my opinion, the way to go.

Also, it has the advantage of humbling yourself before your people, by placing your own stature at a level equal to that of a humble NCO, the part of the army that does the real work. This in itself is another benefit, as the corporals, sergeants and Warrant Officers (or their Deutch equivalents) are generally perceived as no-nonsense, get the job done type of people.