You may want to pop in the date andnumber of people on the online dining reservation site and see what is still left and go from there. the 180 day mark was about 2 weeks ago if I am recalling correctly, so some of the more popular restaurants (like Liberty Tree) may not have any reservations left.
Good luck-we are also headed there for Thanksgiving!
eta: I just put in 4 people and chose "dinner" for Thanksgiving and there were some nice options still available, including Cinderella's Royal Table . That seems to be a good way to be able to get a good overview of what is available at the parks and hotels
It really depends on what you want to eat....if you want the turkey and dressing I would suggest Liberty Tree Tavern. 50's Prime Time Cafe for home cooking, or a family BBQ at Mickey's backyard BBQ.... You really can't go wrong, you just need to figure out what you want, and that is probably the hardest part. LOL...