I wouldn't limit your options to The Contemporary. Since it's on the monorail loop you could easily book something at The Poly or GF.
I would probably recommend Kona Cafe @ The Poly for a sit down meal.
Last time we were at CM we found the quality of food very poor, the restaurant was unclean, food everywhere all over the floor. It was just not up to par for Disney.
If you are looking for quick service, I think Contempo Cafe in the Contemporary is great! They've got a great flatbread! Their sandwiches and salads are also quite good.
Have fun!!