Sup man , yeah i would have jump on it too , god knows ive spent a lot more and got a lot less.
Knowing me i would have tried to jew him down a bit specially if he was oozing naivete. I would have popped it open told him the the flux capacitor caused the hdd to burn out it and it would probably never work again. dare i say we would have both walk away with a smile on , him for getting rid of this time bomb and me for a steal of a deal 😛
not to mention that opening it you can tell if its be played with.
As for hardware Meh , the first gen I7 stuff is long in the tooth by now , but its still good. case looks good though OEM mini atx cases are practically free , PSU seems like it could be useful, and the most important win 7 coa sticker which is the golden ticket to next gen. Barring no other hardware or software gremlins, i would first throw in some ram ie max it out, if you happy with performance . then next would a small cheap ssd 256 sammy used , not to used tho. And if you are still happy i would get the Gfx card. Watch the pci e gen of the board no point in exceeding it. Old doesnt mean obsolete , at least not yet anyway
*** edit**
seriously $100 , ive spent more on blow jobs and beer and the the only thing i have to show for it ,is this persistent itch gtfo