You should try these! All of them are pretty affordable and have great food.
Thai: The King and I on South Grand
Pizza: Feraro's Jersey Style Pizza in Soulard
Brazilian: Yemanja Brasil in Benton Park
Gelato: Benito's in Clayton, Frontenac and Chesterfield
Authentic Mexican: Bronco on Cherokee Street
Americanized Mexican: Chava's in Soulard
Burger: The Billy Goat on Vandeventer & Boyle
Italian: Trattoria Marcella on Watson
Asian Fusion: Zoe Pan Asian in Central West End
Tapas: Barcelona
Sandwiches: Blues City Deli in Benton Park
Enjoy!