I would be perfectly satisfied with my PA3X-Pro 76. It's really the arranger of my dreams, because has the best feeling keybed, the best styles for the music I like to play and great sounds (plus 256 Mb of RAM to load even more of them). Right now in my house there are five keyboards, but if I had to choose just one it would be the PA3X.
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Korg Kronos 61 and PA3X-Pro76, Roland G-70, BK7-m and Integra 7, Casio PX-5S, Fender Stratocaster with Fralin pickups, Fender Stratocaster with Kinman pickups, vintage Gibson SG standard.