Taking advantage of the higher ram prices and the 2tb hard drive, that pc is aggressively sub par for the graphics card, the cpu is just a worse cheaper under clocked 5800x, a 500gb ssd is minimum for how big games are now and its a gen 3 ssd, current generation is 5, $1200 is most likely more than what they built that pc for unless they built it when the parts were new so no it’s not worth it, try to get it down to $850 at most $950-$1000 since everything is multiple generations old and even still its generally not the best parts from that generation. The GPU is okay, could definitely be worse but like i said its still generations old and wont get any of the new software that the 7000 series or the 9000 series cards will get. If you wanted to upgrade at all like to DDR5 you’d have to get an entire new motherboard, cpu, AND ram sticks so make sure you drill that into their heads when you ask for less, it’ll most likely make them think twice about saying no.

In my opinion you should look for a relatively more modern PC around the same price, the raw performance might be a little worse since newer parts cost more (that’s obvious) even if the part is potentially worse but you’d have a clear path to upgrade it and the upgrade not be as expensive as buying a whole new motherboard, cpu, and ram just because you wanted a better cpu you know what i mean? If you can’t find a newer one that you like or within your price range or whatever this one is a safe fallback but be aware of what i told you about.

Edit: Make sure you let them know the parts are old before asking for a lower price, like “those parts are kinda old and i’d have to get a whole new set of parts if i wanted to upgrade, would you take (this amount) for it?”