So here are my observations and my final choice. I did some research on the plane's wifi connection and went to each casino's website to see what they were offering for Thanksgiving.
There's a three hour difference between Indianapolis and Vegas....so when I got off the plane it was morning in Vegas but afternoon from where I was coming from. So I was ready to eat. I noticed if you go early on Thanksgiving 11-1PM you have plenty of options available. I almost went to the Cosmopolitan buffet as it was not a long line....but I couldn't bring myself to pay $50 for turkey. But that buffet was easily accessible around noon.
Over the course of the day I saw plenty of seating available at plenty of locations. Pick your sit down restaurant and there were seats available. I noticed Hash-House at Plaza had some nice plates.
My choice:
I ended up driving out to Boulder Station. They were offering up 10X points in the casino and were only charging $12.99 for the buffet. And the line was non-existant in the early afternoon. It had everything you would expect for Thanksgiving and all made with real ingredients: Turkey, mashed potatoes, stuffing, cranberry sauce, and pies. Nothing original or exciting - but neither is that the case when I make Thanksgiving dinner at home. If you just want the Thanksgiving basics, cheap price, and accessible line then Boulder Station a fine choice. They also had Pierogies which were pretty good.
All the Station mid-range properties have the same buffet - so that would be Sunset, Santa Fe, Boulder, Palace and Texas. Green Valley Ranch and Red Rock were slightly more expensive and the Fiesta properties were less expensive.