I really like Amarillo, but after brewing two pale ales that were heavy on Amarillo, I'd have to say that I like this hop best with other hops for balance. On its own, Amarillo is really fruity and a little funky (like underarm or MJ funky). This may also be individual to my beers, but I find the aroma and flavor of Amarillo a little front-loaded. Its hits hard and then its gone.
I really like Cascades with Amarillo, which seems to cut into the Amarillo funk and provides a more dimensional aroma.