In Cleveland, we have a popular restaurant called "Melt Bar and Grilled". They feature several dozen different types of grilled cheese sandwiches. Most of them are stuffed with various other foods - various meats, veggies, pierogis, etc. This seems to be a popular trend for restaurants, so the food isn't just simple grilled cheese sandwiches.

FWIW, Melt Bar and Grilled has been featured on the Travel Channel and Food Network.

In case you care to see the types of sandwiches they serve: http://www.meltbarandgrilled.com/