Well if you are just looking to bring beer home, then binnys is your best bet. No new glarus in Illinois though, you'd have to go to the Wisconsin border for it. As for stuff you can't get down south, here is my guess:
Founders
Finchs
Half acre
5 rabbit
Argus
Two brothers
Argus and Finchs are hit or miss, so if you are stuck deciding, get the other four lol. 5 rabbits recipes are designed by randy mosher (author of radical brewing)...and oddly enough, their beer is contract brewed at argus, but far better Haha.
Two brothers is releasing 15 anniversary beers this year, don't think you get them down south and its likely these ones are limited, they have all been pretty solid, and not too expensive. The mild is great.
If you grab a hoppy founders be sure you check the bottle date, I've gotten some poor tasting centennial Ipa from them when it wasn't fresh. And all day Ipa is a must, delicious beer.
Other than that, just walk into binnys. You'll spend half hour just looking before you even decide. Ask an employee what's new and not available down south, they are usually pretty good about recommendations.