I've seen this question come up a few times on this board and I've been doing my own research, so I thought I'd post my findings so far:
La Vigna (Front & Federal) prix frie ($29.95). Abraccio (47th St) 4 course Tuscan holiday or Traditional Thanksgiving ($27.50)
City Tavern ($74.95)
Lacroix ($75.00 for hot and cold buffet)
Astral Plane 3 course prix frie ($40.00) veg, fish or sirloin option available
Davios (order off menu or family style at $60.00 per person).
waiting for prices/menus:
Dark Horse Pub
McCormick and Schmick's (last year offered traditional Thanksgiving meal as well as off the menu items)
I'd appreciate any additons/feedback. Still haven't made my own reservations for a party of 4 adults...