If you look through the forum, you’ll see that there are a number of people using an 8TB SSD in their NUC.
If I would be in the market for installing an 8TB SSD into my NUC, I would probably get a Samsung QVO model, because as Danny said:
As for the choice of an i7 over an i5 model, that will depend on your own situation; if you have a large library (12K+ albums) and make use of heavy DSP for multiple endpoints, then you’re looking at the i7…