The collector in me says you ought to get a Royal 10 as your 10th machine. But what do I know? I bought a Remington 17 as my 17th and I'm looking forward to the days I'll buy the milestone Remington Ten Forty or the eventual Hermes 3000! 😁

If it helps, at Virtual Hermans 2022, Richard Polt recommended someone justify their continued typewriter collecting to their skeptical wife as an "investment" because typewriters are holding their value well.

I personally don't have a typewriter collecting problem, I have a typewriter ribbon collecting problem that's compounded by need to both store and use them in their original historical context.