Is Steak n Shake not a thing where you live? They're nothing special. Although their chili cheese fries are pretty good even though they don't usually look good. We got a Freddie's in the area recently, which looks to be along the same lines. Haven't tried it yet though.
Five Guys is good, but I'm not super impressed with it. It's about like Backyard Burger to me. Not amazing, just good. Haven't had Whataburger yet. So far for me S&B's Burger Joints blow every other burger place away by far.
@gr8whitetrukker if you're ever up in Oklahoma hit up an S&B's. If they're as good as the Illinois location you won't be disappointed.