Citrus...
Finish and dry hop with Amarillo, Centennial, cascade, Citra, and Galaxy. To be honest, unless you use twice as mush cascade as the others, it will get lost. I always bitter IPAs with Columbus.
I'm kicking off 2015 with an obnoxious IIPA on the other end of the spectrum with dank/resin/piney with a combo of Columbus, Simcoe, Chinook, and Centennial. Centennial in both citrus and piney IPAs? I forget who said it here on the forum but I love it... "I use Centennial in everything that ends with an A."