My friends and I will be in Chicago over July 4th weekend. We want to try either Blackbird or Avec. Based on reviews and menus, I would prefer Avec but I see they don't take reservations. If we go on Saturday night, is it worth our while to wait for a table or should we just reserve a table at Blackbird? Truth is, two out of three of us cannot drink alcohol, so we'd be going for the food not the wine. Also, we're staying at the Wyndam near N. Michigan and W. Ontario. We'll probably take a cab to the restaurant. Will it be easy to catch a cab back to our hotel after dinner?