Looks like your current rig is almost identical to mine in terms of components.
That said, the processor and the motherboard (because it only supports 8 GB of RAM) are the limiting factors for both of us.
From there, doing a Mobo, CPU, and RAM update is probably your best bet (and what I would do, too). Your PSU is plenty powerful to handle it and all of your other components should be just fine to use (except if any of them use IDE connectors, since those have been phased out by just about every modern Mobo to allow for more RAM and SATA slots).
I can't really answer about better parts and better prices. Hopefully someone else can handle that. It's been a long time since I've looked at computer hardware.
That said, I think 24 GB may be a little overkill. 12 or 16 GB should be plenty and you can always add more later if you want or need to. I'd save the money that you would spend there and would definitely suggest that you add an SSD. The technology is amazing and they're getting to the point of being cheap enough that they should be a part of just about any serious gaming rig build.
Good luck!
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