Geez I can't even remember the model number to my very first one. It was a Yamaha (had mini keys) One (mono) speaker, sounds were terrible (my alarm clock sounds better). It had flush buttons (like the DX series). What was cool about it though is that it had some basic voice parameter buttons to edit the voices. Patterns sounded worse than my cheap basic sound card in my computer.
My next board wasn't an arranger. It was a Casio CZ-1000. Owned many synths between that time.
I didn't buy another arranger until the original DJX was released. Also bought a PSR-540, PSR-550, Casio MZ-2000, and currently use the WK-3500. Had a short run with the PSR-2000 (but had some problems there).
Squeak
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GEAR: Yamaha MOXF-6, Casio MZX-500, Roland Juno-Di, M-Audio Venom, Roland RS-70, Yamaha PSR S700, M-Audio Axiom Pro-61 (Midi Controller). SOFTWARE: Mixcraft-7, PowerTracks Pro Audio 2013, Beat Thang Virtual, Dimension Le.