My favorite sit down restauraunt would be Tsuru Ton Tan. It's my favorite because I love udon, and their udon is really good. It comes out in huge bowls and although it isn't the cheapest, it's an experience worth trying out.
This is the shrimp tempura udon. The bowl is bigger than my face and the dish comes with many different vegetable tempuras as well. It's my go-to.