I am listing everything on 45cat.com which is easy and can then be downloaded or printed off with values which can then be presented as a comprehensive individual list and total value for insurance purposes which I am told some Insurance companies want. I find it a good way to total up your collection if required.
It takes an average of anyone who has bothered to value and you can put separate ones in for demos though it values at mint or you can put in your own at where you grade your own.