Steak 'n Shake
I haven't gone past the top three in a couple of years. And there aren't any In-n-out burgers around here, so don't tell me that I'm missing out.
Steak and Shake is great. The prices are very reasonable, and my local one at least seems to be the last bastion of the cheery, smiling, hard-working 18-to-20 something employee.