Catering ideas?

My office is holding their yearly party and I'm in charge of food, but I'm not sure what's a good place to cater from. We can't have anything with pork as we have diet restrictions and thus must have optional vegan dishes. We had Italian food last time, so no on Italian, and we pretty much have pizza and lunch boxes every month so no pizza or sandwich boxes. I was thinking of Thai, but I know some of their dishes do contain peanuts and just to be on the safe side, I won't get it.

Any good places that you would recommend? This is for around 20 people.