In the past, we've gone to BOMA after the AK. BOMA is great....especially their soups!! And in Feb/March, soup is probably a good thing to eat (especially if it's as cold down there as it has been lately!)
This time around, we are going to DTD after the AK (it closes at 5pm) and eating dinner at Wolfgang Puck's Cafe. (the sit down restaurant). We've eaten at Wolfgang's Express MANY times and it is FANTASTIC...I've never eaten at the Cafe before, so I hope it is just as good!!
T-Rex is a good choice too. Not on the dining plan, but they DO accept the Disney Rewards Card. That is how we paid for our lunch in 09. My boys loved it there, and we thought the food was pretty good, and the portions (at least what we ate) were large.