I own everything listed on the Tenchi Muyo CDs page except for 8122-P "Radio Tenchi Fan Disc Masaki Kiriko's Top and Bottom Mental Journey" (ラヂオ天地ファンディスク 正木霧恋の天地めんたるジャーニー).
If you know where I can purchase it, please email me!
Here are some pics of my collection:

#1 - Most of the audio CDs/Casettes/LPs:



#2 - The drama CDs that come with DVDs/Blu-rays:



#3 - Games, Software, Misc: