Which synth have you owned that you won't forget?

Therefore, most of my keyboards have been little toy Casio type things (which, when amplified through guitar FX and played through a 50 watt amp, sound quite amazing).  

The only "keyboard" I own was inspired by King Crimson's show in Chicago, 26 Sept 2014.  I was gob-smacked to see band members summoning lush, loud Mellotron patches using...errrr...i-Pads???  Jaw-dropping! 

I did my research and Mr Fripp spoke fondly of the "Mellotronics M-300" app for i-Pad.  I downloaded the app to my i-Pad, it is great fun, playing the rich vocal intro of "Dancing with the Moonlit Knight" and annoying my wife!!  I don't believe the app is available in the USA anymore, but there are other similar apps.  Highly recommended, as virtually anyone can play a Mellotron and sound good!