Did you already try windows 10?
Proably the next system you will buy will have a pre-installed Windows, and it will probably be windows 10.
If you want to train yourself re-installing your next machine, you could consider trying this release right now.
Microsoft allows you downloading it from here :
https://support.microsoft.com/en-us/products/windows
It's supposed to only be a preview. However, it's already a fully fonctional and very professionally designed release.
The installation is as easy as the previous Windows releaseses, and I appreciate the fact that the tiled screen is not any more the default one