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Please read the Piano Forum FAQ for more details. Also, read the piano FAQ for common questions on pianos Please don't ask us to place a value on your piano as an on site inspection is required. Contact you local piano tuner who will be more than happy to help.
To get an idea you can check:
Have a look at this post. This guy was rating a variety of pianos that he tried in a shop. His views are fairly consistent with what other people are saying (generally speaking).
http://www.uk-piano.org/piano-forums/vi ... korg+sp250
As for Kurzweil, I find anyway, that some of the piano samples are a bit on the 'tinny' side - far too bright. They really could do with an external equaliser to mellow the sound slightly.