Well that settles it - a 2TB base model will suit my library nicely with room to grow. Thanks everyone for the prompt and detailed responses. And the encouragement!
I am really excited to take this plunge. I have been spinning my CD's and some SACD's on the K-03 for a number of years now. When I bought the K-03, one advantage to me was the ability to use the DAC at a later date with a server. Opening up the Tidal universe is, well, going to be amazing as well. I watched the Olive servers come and go, and was waiting for something like this which hopefully will serve me for a number of years.
This is a great, passionate forum. I try not to abuse it with silly questions, but I know I will have some as I try to get set up. Thanks for being patient with me.