Beef Invictus
Revolutionary Positivity
If you're going to go that far then you should also get a new case to put it all in, and a new monitor so that everything looks shiny. Maybe new cables too, just to make sure that all the current gets where it's supposed to go in a timely fashion.
Should probably put in a hardwood floor and touch up the paint, too.
I've been on this train too. My system is running at around 7 years. I don't need an upgrade, but there's a good chance my storage HDD is going to start failing soon. And it would be nice to have a faster processor. Case and power supply are fine, and I would actually take the opportunity to fix how some of the internals are arranged. Since I don't game anymore, I don't need a new GPU. But I'm stuck on what to do about an OS, because I despise W10 and kind of need to stick with a windows system for some of the software I use. I'm sure there are linux alternatives, I just need to make a list of what I need to download.
The hassle of making this work is probably going to be more of a chore than dealing with an OS you hate.