Recently I used cascade. It has a lower AA but I used enough to bitter to about 60 IBU.
My thought behind it was as I looked at recipes a lot were leaning towards English hop varieties and cascade is a daughter of fuggles and I was wanting an American stout so I wanted American hops.
What size batches are you brewing?
I also live in Chicago and I plan to use distilled water from now on and build my water based on the style rec from the brewfather software.