I really liked the Dark Elves fleet master, or how ever the bloke is called. I slightly converted him and used him as my HQ. Since it is a themed HQ it is easily used as a count-as for at least the archon or the duke. I even use him as Vect, for now, aboard the main ship of the fleet.
The main ship is actually way to big to field effectively (roughly 35 cm in full length, Hopefully my opponents will agree to use the base of ship as the actual size of the model....
Maybe you can draw some ideas from it:
The Malevolent Maiden