Any of the "c" hops will play nicely together. Willamette is a super duper aroma hop with a lot of flowers and spice notes. Think of it as a noble hop. If it were me, i'd use columbus as your bittering hop, cascade as a flavoring hop addition and then a buttload of willamette as an aroma hop via a hop steep after the boil. You should be able to produce a nice hoppy IPA with that hops schedule.
Beer so good, it's frightening.
2014: Seven Heavens Series One: Vilon, Mystic Melomel, Skeeter Pee.