What Breed?!

I have no idea what breed to do.

What it must have:
It must be common to get roan in breeding and equine center (no need for customs), preferably mostly RnRn!
Darker common colors (black, bay, etc...)
No mustangs or Gypsy Vanners (already may be doing GV)
No welshes (already am doing them)

I will be breeding for roans, so..........

I would suggest paints or quarter horses. they have some of the prettiest roans in game. They are both common horses, so selling and buying should be at least semi-easy, and roans are fairly common in both of them.

I'll link two of my roans in each breed as an example.
Quarter Horse
Paint

From what I've seen, Chincoteagues have roan often.