How much ?

[XLR8]

I'm thinking of selling my saphire radeon HD 5850 1 gb video card . Never been overclocked,well taken care of and have all software and box for it . Bought it in March of 2010,and paid over $300 for it . I want to get a Gforce 460/470. I have been told there about the same in performance . But I'm a Nvidea guy .

Any ideas about how much I should ask for it ?