Bullion is a classic Stout hop, many classify the flavor as 'Black Currant like'. I tried to get it but couldn't so went with Northern Brewer. It is a great choice. I think this hop may be being usurped by better storing varieties and it is getting hard to come by. LD-Carlson (a major supplier for NE HBS's) no longer can get it.
Event Horizon ~ A tribute to the miracle of fermentation.
Brew what you like. Do this, and you will find your inner brewer.