I'm sharing your excitement about making that final payment! We have sailed on the Grandeur twice and loved the ship.
We will be on the Legend, which is a small ship. It will seem strange after being on the Navigator for the last two cruises. Each size has its pros and cons, and for a Panama Canal cruise, it has to be a smaller ship. I won't be able to eat as much, because I won't be walking as far to our cabin!!
Have a wonderful cruise!