I'm so happy I found Dimple. Midtown is kind of a wasteland as far as interesting vegan food goes. Dimple has saved my lunch break.
It's authentic south Indian fast food. The chats are the highlight - cheap quick meals like you'd find in India such as bhel puri and sev puri - beans, potatoes, and onions in spicy sauces with puffed crisps - and vada and samosa pav - basically a vada and samosa sandwich, respectively.
They also have more familiar south Indian dishes like dosas, idli/vada and sambar, uthappam, etc.
You can easily get a full meal here for under $10 - under $7 or $8 even.
I haven't tried the buffet - it looks like any buffet you'd find anywhere else, so I stick to the special stuff.