What kind of ballpark were you thinking about as far as the chili farm price. I would throw out a number myself but I tend start pretty low (so I'm told) so I thought I would try another approach.
I have several of these things myself so I'm very familiar with them.
I would say something roughly commensurate with the going ebay price for BFL hardware as a starting point. Try chucking a number out and we can work from there. Don't forget that there is a reasonable amount of added value in the 6 large PSUs and laptops etc.
Where abouts are you btw? And what would your preferred currency be?