Thanks for your input! Well, as for the gaming part, I do wan't to be able to do some gaming if I find the time in between sessions. I have a dream to compose for games, and so I find it very relevant to at least try to keep up with the trends by playing some games myself. It's also a lot of fun!Counterpointer, do you really need a graphic card in your DAW?
The integrated graphics of the 9700k work fine if you're not into (heavy) gaming.
Even using multiple screens isn't a problem, and you have less heat & noise issues.
The Samsung 970 EVO 1TB is IMO an excellent choice. But why a separate 250G one? When starting from scratch, I personally would try to keep an M.2 slot free for another 1 or 2TB NVM SSD in the future when prices come down...
And for the discs, my idea was to put the OS and projects on a smaller disc (250GB or 500GB) and all libraries on a separate, larger disc. I was under the illusion that one saves a bit CPU by installing (at least in Kontakt) the applications on the C-drive and the samples on a separate drive. Am I wrong?