Pontic Heavy Cavalry

[Craterus]

Also, heavy cavalry kinda screams MELEE at you.

Oh yeah, and how are they elite missile cavalry? Call them missile cavalry if you will, but they are not elite. I can think of other mounted-missile units that outclass them.

Scythian Noble Archers
Scythian Noble Women
Scythian Horse Archers
Horse Archers
Chariot Archers
Cataphract Archers
Persian Cavalry

Arrows outclass javelins because there are many more volleys, and as we're evaluating their missile ability, you can't bring melee superiority into it.