My solution is to divide the systems between my three children. Once they have the components, which will be split so that each child has a nice functioning systems they can either get excited and keep their system or they can sell it on their own and make a little bit of money. I will even out the value the best I can by identifying some of the extra components should go to the children with a lesser value complete system. I am lucky that my children will not bicker over a tiny bit of money difference, so I believe.
One of my children is totally into music so that is an easy decision who gets my main system. They also have the space for a larger system while the others will be very content with the smaller systems, all being nice system capable of producing a great sound. I am going to go over the entire process well ahead of the time they will be split up. Should be an interesting discussion.
Concerning the CDs I still own, my son in-law loves music and is an avid collector so he is the logical choice to hand this collection down to. Any discs he does not want can be sold off and the money split evenly. He buys and sells CDs and Vinyl regularly.