As part of the skycurser project, I've been able to see a lot of arcades in the regional Midwest area. For me I'd breakdown some of my favorites as follows:
1. Logan Arcade: Amazing bar with an immaculate collection of games. The owner there is the real deal, he's super passionate about taking care of the games and creating an awesome vibe. I can't express enough how nice the building and games are. I love this place.
2. Galloping Ghost: It's sensory overload. I agree that it's getting a bit crowded, but they are expanding their space significantly to address the issue. They just added their game number 500, which is insane to even think about. The owner, Doc Mack is one of the nicest dudes you'd ever hope to meet. Plus, they actually take JAMMA era stuff serious and they get the really rare shit no one else messes with (Fallen Angels, Primal Rage II, Cliffhanger: Edward Randy, etc.) There were TEN six slot NEO GEOs there last time I visited and they were all working.
3. Tappers: A brand new barcade in Indianapolis, I got to attend a soft opening last week and I was blown away. Great diversity of games in really nice condition. It will definitely be my primary bar for the foreseeable future.