I always need to justify buying new gear by selling off my older gear...
I wish I could get away from this concept...There have been so many great keyboards that I have owned, and wish I still had them..
I often revisit this gear via purchasing from others..the same models...but it is not the same as my "baby'd" gear..
If I had to just name a few boards I wish I kept..they would include Yamaha DX7, Roland JX10, Roland D70, Roland XP80, Roland G1000, and Ketron X1...
I really wish I were like Captain Russ...I would have kept hundreds of the boards I have owned...

Accordions, organs, and virtually every keyboard made....