Trying to buy Gaming PC used wanna know how much i should pay for

Most of these parts are mediocre for gaming. In order of importance:

CPU: pricey for a quad core. Yes it says eight, but it's effectively a quad core. Does what an i5 does but notably slower and for about the same price. Not particularly useful for gaming. Teir 2 at best.

GPU: HD 6870. This is a entry budget card. High enough to play most games on high at 1080p but nothing special. Retails for $125-140 as of recently. Not yet an old card but there are two new series since this one. meh.

RAM: probably not that fast, and 8GB is great for a gaming PC but not hard to find. specs aren't listed so i'm going to assume normal, boring ram.

the rest is really irrelevant to a gaming system. Any offer I would make on this would be insultingly low to the seller. 2 SSDs is an expensive and stupid investment.. useless raid 0 config to top it off. built in sound like almost everything.. .. what's worth paying for here?