Miden,
it all depends on your location: apparently Australia isn't the best place in the world to resell a Ketron... but I will give you an example. I own a Midjay, that currently sells here in Italy for 1300 euros (1776 USD or 2151 AUSD); however, you can buy one from Synthplanet for 1100 euros (1503 USD or 1820 AUSD) and the current reselling price here in Italy is about 900 euros (1230 USD or 1489 AUSD). So, not a big loss at all after maybe one of two years of usage.
Clearly, you should resell it before a new model comes out...

[This message has been edited by Dreamer (edited 08-29-2007).]
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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.