@ED
Thanks for your agreements!

@Theme: weighted keyboards
Light or heavy weighted kb - that's the question (a little bit of W.Shakespear)...

I'm not a keyboard player at first. I'm a guitar player. Nevertheless I have to confirm with that what ED said - it's not easy to change between these two kinds of keyboards. After playing a longer time on a light weighted kb I couldn't get any correct tune out of a real piano (Steinway). I was laughing out loud but I really couldn't hear any tune...hahaha. I couldn't believe it but it seemed to me that my hands were to weak for playing...*lol*
@hauschild
You talked about your Kawai K3. Are you still playing with it? I know that the K1 had have some fine colours even a great orchester hit. Let us assume I'm allowed to give you a tip I'd advise you to keep your 'little' K3. You could use it as a second kb for controlling sounds like organ, strings, choirs and so on...

For piano and other hammer action sounds try to get your heavy weighted 88 keys with that weight you need to feel good. Check it out in a music dealer's shop! There's no better way to do it! Try it again and again until you're shure what you want/love!!! Don't let you making nervous by the dealer's finger tippings and lousy frozzlings...

It's only a humble opinion...
Good luck for your choice!
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Greetings from Frankfurt (Germany),
Sheriff ;-)