Last Alliance human figures from the Games Workshop LOTR skirmish game ("Middle Earth Strategy Battle Game") are good. Winged helmets are attested, as is also true for Gondor and Arnor.
Byzantine historical figures would work well. I prefer Early Byzantine and Thematic period Byzantine for Numenor (and Early Gondor and Arnor as well).
Mounted archers used by Numenor were not men of Numenor, they were local men serving in that capacity. Mounted bowmen without armor.