As I'm down to only two massive piles of lead to paint it's obviously time to look for a new army

I want a streamroller cavalry/Kn/Cata type army with very little foot. But I plan on using one of the Army Painter matt plate mail primer sprays to speed the painting up. I would prefer to spray as much of the army as possible and just add things like plumes, trim etc. So what army fits the bill? Some medieval one with horse barding? or maybe Persian-ish cataphract?
Thanks in advance,
Ferb