I was going to second what macebre said about the roaning; it's usually called Rabicano roaning, and he won't become roaned all over his body like a normal roan, and may only 'roan' a bit more each year, or seem to stop all together for a long time.
That said, he is beautiful, and if he goes missing, he's not in Colorado! Lol!!!
I do know he is Sabino :)
I've been saying black roan because here in MI no one knows what I am talking about, had a ten minute argument over what to call him with the vet so I've thrown in the towel and called him black roan, guess I loose either way. He is... horse colored :)