Question Looking to upgrade

I don't see any drives in that list. Are you on an SSD?

You might be able to keep the case.

That's a pretty good power supply unless it has been abused. Is it 8 years old?

If semi-desperate, you might be able to keep the RAM.

You need to decide if you can get by with a 200 dollar video card for those games. Or is it 500? I have no idea.

At 1000 dollars total budget, whatever you spend on the video card is going to severely eat into what you can spend on CPU, motherboard, RAM, and storage.

Can you add 100 a month to that budget? Maybe wait a few months if you can?
 
First things first.

Replace the drive with an SSD. You would be able to use it later on whatever PC you eventually build.

Decide how much capacity you need. Put Windows and your applications on it.

You can probably use your existing hard drive for more storage or backup if need be.

That alone will be a noticeable improvement on the first day. Even if you don't spend another dime.

If you can spend say 1200 excluding the SSD, you are probably in pretty good shape...but I can't help you with what video card you need. I don't use them.