My fiance and I are leaving on Thursday and driving up to Springfield VA outside DC. We'll be traveling through Hattiesburg, MS; Birmingham, AL; Chattanooga, TN; Knoxville, TN and Roanoke, VA on the way. Does anyone have recommendations for lunch & dinner along the way? We're on a budget for this trip so nothing too upscale - say entrees under $20. We'll planning to get to the Chattanooga area the first day so that's probably where we'll have dinner. Thanks in advance.