From my own collection - the mighty Sicaran battle tank! When I think of the outline of a typical Crusade Era force I think of Spartans, Contemptors and Sicaran battle tanks. I haven't had much luck with it on the table top (even though I've suffered an Iron Warrior Sicaran pop my Levithan in one turn of shooting). '
If you'd like to paint this red check out the video tutorial I've made for it:
TUTORIAL