I like Etab's idea. Here's a few other sales that might help in valuation:
Domain TLD SalePrice SaleDate SaleThru
ShareInternetFiles com $6,600 Apr 06 SnapNames
JobFile com $3,900 Feb 05 SnapNames
FileCabnet com $2,877 Feb 06 SnapNames
SnapFile com $2,600 May 06 SnapNames
File4All com $1,885 Mar 06 Sedo
JimJam com $1,825 Jan 05 eBay
FilesOnDemand com $799 Feb 06 Afternic
Cheers,
BidNo