Novice here looking for insight on equipment ive aquired

So in a nutshell, although I love music I wouldn't consider myself a sound buff. I own and opperate a residential window cleaning company. I had a well to do customer make me an offer I couldnt refuse last year. I am now the owner of some high end stereo equipment that deserves a home with someone who will appreciate it more then I. Everything is in great to like new condition and id like to sell it as opposed to keeping it. I have done some research on the items but I am hopeful to gain more knowledge about the equipment before I go attempting to list them for sale. If anyone could help me out with some discussion regarding the items I would GREATLY appreciate it! Ultimately what I have is as followes.....
Everything was new in 2000 and I even have most of the original paperwork. 
*California Audio Labs Reciever (with remote)
*Aragon 8008 amplifier
*Airial Acoustics speakers
*M Series by Monster Cables
*All other cables and wires needed for full set up 
   I'm able to provide serial numbers and what have you for more specific intel if anyone is willing to educate me on the equipment. Ive seen the original retail values and was amazed learned that my customer's claims of its value were indeed true! I know depreciation is clearly a topic here and that is absolutely my point of inquiry.