All Booked and Paid - Final Budget about $11,000

Just made my final payment for the cruise.  Now, I just need to wait for December.

I'll be staying two days in Buenos Aires - Hotel Reconquista Plaza  - $115 total for both days.  I'm not expecting a lot, and don't plan on being in the room too often.  It looks nice on the Bookings.com site and has 4-stars.
While in Ushuaia I'll be at the Hotel Monaco one day prior to departure and one day after returning back to land.  The room is $48 each night.

I also opted to buy travel insurance since there are so many things that could still go wrong between now and December, and delays once on the trip.  The cost of my insurance was $403 and covers all aspects of the trip for my investment (~$11K).

3 stop flights from Denver to Buenos Aires to Ushuaia back to Denver was $2200.

And of course, the cruise - I opted for a shared 2-bed room with port-hole - $7950.

Thank goodness I had almost 2 years to save up.