One last rhizome to choose

I want to place an order for 3 rhizomes, and have been reading posts and comparison charts, but still cannot decide, maybe you guys can help me out. I have a few mature cascade plants already (one might be centennial), and want to buy 3 more. I like to brew all types of beer, but mostly IPA's and full flavored porters. I was thinking of getting 2 willamette rhizomes, but I cannot decide on the third. I was thinking of some kind of bittering hop that would be good in both porters and pale ales. They will be grown in the northwestern suburbs of Chicago, any suggestions ?