The ESP Guitar Company

So a guy contacted me asking if I still had my '07 See-Thru Black Viper 1000 Deluxe. This guitar is in mint condition (I think I only played it like 15 times max) with the ESP Hardshell case. So I told him I would sell the guitar w/ case to him for 600 + shipping. He told me he thinks a fair price for it is 490+ 60 shipping, because he didnt think more than 550 was worth it for this guitar, I told him he was nuts and there is no way i would let the guitar go for that. So, do you guys think my price was fairly good for that guitar, or was he right?