I am still a beginner, and was looking to buy non expensive digital piano.
I was mainly looking for the PX-130, then i thought to browse for used keyboards options when i found
Casio PX-120 (the keyboard, wood stand, foot pedals): for 400$ i think this is a good price , isn't it ?
Yamaha YPG-635: for 450$

The PX-120 offer seems to be very tempting, The PX-130 keyboard alone is sold for 450$ ... So the question is what's the difference between the PX-120, and PX-130, would it be critical for a bigenner such as myself ?

Also based on many reviews i am not much into the YPG-635 (i am not interested in other sounds other than the piano), but maybe i am wrong, any advice would be helpful .

Thanks

The PX-120 is a nice piano for a beginner. The key touch is rather on the heavy side, so you are not spoiled by a light touch. Expect the keyboard of the PX-120 to be a bit noisy, though. It tends to get a bit rattly by the time.

The PX-130 has a better sound, compared to the PX-120. More dynamic playability. But it is not like night and day. The sound signatures of both are very related. The keyboard of the PX-130 is a bit less noisy and a bit lighter.

So for a beginner, the PX-120 is very adequate, in my opinion. If you get better and faster, it is likely, that you want to buy something more expensive, no matter, if you bought the PX-120 or PX-130.