How much should I sell my HUGE collection on National Geographic magazines?

I have about 85% complete collection of National Geographic from 1940 to 2007. I will also include about 230 duplicates and about 30 magazines from 1930s. Thats a total of about 1200 magazines. I plan to sell it, and what price should I sell it for? On ebay people sell these magazines for $1 to $10 per issue especially for older issues! If you happen to be interested, I am located in CT, for any buyers. thanks.