Congrats from me to, on making the decision after 10+ pages of great advice with multiple options.
As you see, there is not one best answer, it depends a lot on personal preferences. Same is true for your question about the next lens. Both the 35 and the 85 are great, but have somewhat different applications. I agree with Richard, the best way to find out is to start shooting for a while and then see for what focal length you want to add a prime. Either one will also work on a full frame when you upgrade.

All the best for you and your family,
Arnt