That deal almost is too good to be true. Unless you know the person and can verify it isn't stolen or doesn't have some weird underlying issues, I would pass. If you know the person and it's all legit, this is a super duper deal. It would handle all modern games very well. As mentioned above, this system new would probably be sold for $1000.
I play by the rule "if it's too good to be true it probably is".