If you are literally going to be drinking it during the Thanksgiving dinner, consider making something that isn't of stupefying strength. It's a long day and there's plenty of time to drink, and you don't want people getting wasted at the meal. So I would think something of medium strength that also goes well with food would be a good choice.
Along those lines, you might consider an Oktoberfest or an amber. Those are both versatile food beers, I think, with enough taste to stand up to full-flavored food but not so heavy, alcoholic, bitter, spicy, etc. that they get in the way of food. An amber would also have the virtue of being American!
Other good medium-strength ideas: a lightly sage-infused porter (goes with stuffing); an APA; a fuller-flavored German lager (e.g. bock).
edit: oh yeah, and I tend to find that acidic beers go well with food. Maybe something cranberry-based would be good, or a sour. But a cranberry-infused beer gets some of the depth of sour beers without actually using a sour process.