My keyboard history is a bit shorter than the pasadoble & DonM's, but here goes anyway:

Baldwin acoustic piano (spinet)
* my first keyboard (childhood piano lessons)

Steinway B acoustic Grand Piano (7 foot) - 1987
* you can't take THIS away from me EVER !

Korg 707 - 1990
* my very FIRST synth: Space Age retro design, classic FM, battery powered.

Korg O1W/FD - 1993
* classic Korg sounds

Korg T1 - 1994
* 88 note weighted action but too HEAVY for gigging

Roland RA800 tabletop arranger (with Roland A33 KB controler)
* my FIRST arranger (tabletop module version of G800).
* impractical as access to controls is awkward using separate keyboard controller (A33).

Technics KN5000 (classic pride & joy)
* Excellent jazz chord recognition, very good sounds/styles and EZ to use. great for jazz lounge venues

Yamaha PSR2000 (new kid on the block) - 2001
* Lightweight, great acoustic sounds/pop styles, and currently the BEST bang for the BUCK !