I really like Whattaburger. Their regular-size burger is great if you want one the size of a bread and butter plate (and occadionally I do ). Salad only goes so far sometimes, but their salads are a delicous value too.
Their employees are always friendly and responsive and make your order right, even if there is a mismade burger. The store on McDowell in Midtown Phoenix is equally good, but the 90th Street location is a lot closer to home.
A former coworker who hales from New Mexico, got me into their burgers with green chillies, mustard and pickle. Try it, it's great.
The true mark of excellence in a burger joint is their onion rings (ORs). If those are awesome, the rest of the food follows. Whattaburger serves quality ORs.
Do ask for the spicey ketchup, which tops nearly anything off well here.