How about looking at lists from used photographic outlets and seeing what they would charge. Remove any tax elelment and there you should have a good approximation of the value of the kit.

OR

I don't know about over where you are, but look again at the used photographic outlets and see what they are asking for certain items. Reduce this by say a 1/3rd which will be their profit mark up and yo0u will get a reasonable figure what they may offer.