I think maybe I've posted on this before, but I'm not sure.
Anyway, I always go to Dumas from Amarillo, then over to Dalhart, then to Texline and across a corner of New Mexico to Raton where I pick up I-25. Don't have the highway numbers at hand, but I know the route like the back of my hand since I make that trip several times a year.
Raton pass is "easy" so I enjoy taking this route. The only time I was ever up 287 all the way was as a passenger in a ski tour bus (and that was years ago), so I really don't know about it as a driver.