There are 3 shows that happen every month within an hour of me, so I pretty much just stick to them.
The Tri-State Gun Collectors show in Lima is probably the best of the 3. Then the Maumee Valley Gun Collectors show in Toledo/Maumee is a close second. I also go to the Stateline Gun Show in Montpellier. It's much smaller than the other 2, but if there are no other shows that weekend I will hit it up anyway.
Lima show is this weekend and I'm really excited to spend some money that's been burning a hole in my pocket. Then the Maumee show is the next weekend in case I don't find what I want in Lima.