7950 or 7870?

Ok so I have been shopping and I can guarantee that I will get the 7870 if I want, but I went on ebay and looked for 7950's, and saw some for $10-$20 more then the 7870, so my question is, should I risk getting a 3 month used 7950 or opened but not used one, or go for a brand new 7870?

Anyone?

Depends on weather u trust the person that ur buying it second hand from as it may be faulty