To get another angle on things, i love a good hoppy stout. I live in the south and one of my favorite beers is the Happy Ending from Sweetwater and also the Beer Hop Breakfast from Mikkeller. They are both outstanding examples of really hoppy big stouts. So i set out to brew my own. I emailed Mikkeller and they gave me the hops used and the schedule used. I took that info and made my own version with tweaked hop schedule, but pretty close. They used cascade at 60, 15, and 5 min additions with additional centennial at 5 mins. Then they dry hopped with Columbus (CTZ). Like i said i made some slight changes, but my has turned out amazingly.
So long story short i would go for centennial and cascade combo and if you want to get adventurous go for target as your dry hop...