Norman,
The standard version is fine I have no problem running H2K, MS Office, etc, etc at the same time I have other macOS apps running at the same time - however I have 16GB of ram which would be the minimum I would recommend. I also have been running Win11 at the same time to try it out, no problems
I was not aware there was a one time purchase - I am on the subscription. If you can find a one-time purchase, please advise.
Reach out at any time!