I intend trying out the Kawai CN2, as it seems, from several pianists' reviews, that this one may be even more rewarding than the YDP121.
Also possibly worth trying are the Gem 700 and 800 digitals, I've only heard the Gem sound samples on my PC (hootersmusicalinstruments.co.uk), but this doesn't give you a real idea at all of the sound quality, touch response and overall performance.
You may like to visit a dealer who has good acoustic and grand models as well as digitals, and try out a few pieces, transferring from the digitals to the acoustics for comparisons.
Hope you find what you're looking for!
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