Hello there,
I live in Israel,and recently returned to play,after 18 years of not playing the piano.
I'm interested in buying a Digital Piano.
Have played today on all of the above.
Korg felt the closest to an acoustic piano,in sound,and had a good touch also,but doesn't have a Pitch Bender and only 30 voices.
The DGX640 felt a little numb,both on the sound side,and the touch sound,but its samples of voices are very good,in general.
Casio felt something in the middle:The keys were quite responsive,felt "hard enough",it has a lot of voices,a pitch bender,and the sound was quite OK.
I think I should go on the Casio,but there's one thing that really bothers me:
I know Casio's keys tend to click after a few months,and that their build is not as good as other DPs,like the Yamaha's,for instance.
Do you think the Casio would be a good choice,in the long run?
It really feels like an all arounder.
One last note:
In Israel,Yamaha is being imported mainly by one Music Shop Retailer.("Kley-Zemer")
The outcome is,that Yamaha's products are quite expensive.
The DGX640 costs 4,725 NIS,and comes without a stand,nor a power supply.
Korg comes with a stand,a sustain padel,and a power supply.
It costs 3,600 NIS.
Casio comes with a sustain pedal and a power supply,and costs 2,945 NIS.
(1 US$=3.5 NIS)
So,there should be a great consideration in terms of cost-efficiency.
Thanks for your help,
Yohai.

I've had a Casio PX330 for almost 2 years now and have never had any problem with clicking keys or inferior build. I did have a yamaha before that, the YPG635 and I preferred many of the tones over the Casio, but I liked the Casio's touch better. I had also wanted midi in/out which the Yamaha didn't have. I've no experience with the Korg.

You may get more response on the Digital Piano category

Thanks for your reply.
Didn't notice the DP section.
Thanks for pointing that out.
Cheers,
Yohai.