Hello, I was planning on getting a factory overclocked GTX 650 for $89.99, and then I found a used ASUS GTX 460 on eBAY for $70. It hasnt been overclocked, and it looks good physically. No returns, but item is covered by eBAY buyer protection. What should I ask the seller before buying, or is it advisable to buy used on eBAY at all? thanks.