One of the best beers I ever had was a beer called 'Chocwork orange'. It's an orangey old ale. Absolutely delicious.
http://www.brentwoodbrewing.co.uk/product/regular-beers/chockwork-orange/
chocolate stout with tons of amarillo would give you that, I had something like that on tap at the post office vaults in brum once. not bad at all