The only one I could speak to semi-directly is Succotash; I've been only to the one in DC. Still, it's well-rated and it's right in National Harbor. You also have good options in nearby Alexandria if you're willing to drive (not sure about the parking situation, but you'd probably have to pay) or, even better (but more expensive), take the ferry from the Harbor to Old Town, then walk or hop on the trolley. I'd recommend Nasime or Vermillion. There's also the venerable Taverna Cretekou, but I've never been there. And if you get to Alexandria early, you can visit the Torpedo Factory Arts Center (it closes at 6), which is right by the ferry landing.