Buying gpu's on ebay

i'm currently looking to get the sapphire 7970 ghz edition vapor x 3gb for around $300. i like this card because its the strongest for the money (in my opinion) and it also has a nice look that would go well with the rest of my build.

but i am worried about buying on eBay and i would like to hear from experience and what the best way to go about auctions buy it now etc.

I buy and sell stuff all time and dont have any problems the 660ti I am using right now is off ebay and I got a killer deal on it

Personally i do not use ebay for hardware, a few friends have done and its been hit and miss. 

One friend got a decent card although it used to over heat like hell, whilst another got a card and it came with its heatsink/fan removed so he had to find a replacement.