Melt is always an awesome place to go to, be ready to get in a food coma afterwards. Typically you either want to go early and eat, or place an order for pick-up. It gets packed at every location quick and if you get there during prime time be ready for an hour+ wait.
In actual downtown, Pickwick and Frolic is a really nice restaurant with awesome food. Their meatloaf is to die for.
http://www.pickwickandfrolic.com/