I know you didn't ask, and maybe you are looking for a place to spend QS credits, but if paying out of pocket I would definitely go with The Plaza over either Pecos or Ray's. Much more relaxing atmosphere, better quality food, and it costs roughly the same or a couple dollars more at The Plaza. For instance, you can get a Reuben, tuna sandwich, or club sandwich for $15, which is roughly what one of the larger cheeseburgers would cost at Ray's. That said, you'd need reservations or might have a fair bit of a wait, and I'm not sure what the reservation situation is right now at The Plaza.