After seeing Adam’s list, I don’t feel so insane. Been finding some good ones the past couple years. Off the top of my head:
Casio
VL-1, the Da Da Da keyboard
SK-1 (found one almost new in the box for $9.99 with batteries a few months ago!)
SK-5 that’s barely holding together
Rapman
VA-10 Voice Arranger with all sorts of noisy DSP effects and a mic input
CT-6500, a 61-key monster with a lid, Precursor to the Tone Bank series
MT-100, which has a graphic EQ
CK-500, a boom box in keyboard form - has a double tape deck and AM-FM radio. Same sounds as the MT-100
HT-700, which has an actual synthesizer, albeit a weird one
MT-520, with the yellow drum pads. Also a pair of Sound Sticks to plug into it
MT-240 with 210-sound Tone Bank I reunited with after having one going into high school
CTK-611, a favorite rompler that I also reunited with
CT-S195, one of the new-gen Casiotones that works with the Chordana app
Yamaha
PS-55, rough but ready. First Yamaha with PCM rhythm
PSR-60, an update to the PS-55 that adds MIDI, keyboard percussion and cassette jacks for loading settings. $10 Goodwill win with music stand, stand and AC
SHS-10, the red keytar everyone wants
PSS-680, a baby DX with 2-op FM synth, drum pads, MIDI. Largely regarded as the king of all Portasounds
PSR-730, top-of-the-line 1997-vintage arranger I’m proud to have only spent $25 on. Sounds hold up well and the floppy drive still works - even has the demo disk!
DX-21, my only true synth
Original DJX, which most agree is best DJX
PSS-14, a cute kids’ board with some fun songs built in
DGX-660, the dining room piano
Incoming is the PSS-795, younger sibling to the 680 which replaces the FM synth with a vector joystick that mixes 4 of its 100 voices
DD20 and DD55 drums
Should also mention my Kawai organ, which I should fire up more often