Full details at https://www.cnet.com/forums/post/3ef4c495-10ec-4348-8dc1-1322367b0f7f/
You are keeping the CPU, RAM, motherboard and the 2TB HDD. But be sure to test that 2TB for out of bounds SMART Values 01 and 07. The example at link shows the machine performance was dogged by the usual HDD issues (01 and 07.) It's the first thing I changed and you can see the performance hit it had.
I can't answer your graphics because I don't know if your monitor is 1080p, some 2K 144Hz or (you won't be doing this) UHD 4K.
But for most of us:
1080p play: GTX 1060 6GB
2K 144Hz: 1070.
I see your list has the 580 so my only quibble is that some boards, mostly old ones can get into trouble over the PCIe slot power draw and it's very hard to troubleshoot.
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