Arimis wrote:"If you decide to buy a new keyboard novadays, what will be your shoice? Which keyboard do you buy?
yamaha tyros3, korg pa2xproi korg pa800 or waiting a new one?"

I would not buy another keyboard.
If I were not limited to the choices you provide, I personally would like to have a module, or two, based on the technology and features of any of the boards mentioned above in addition to some not mentioned, e.g. the Ketron Audya and Roland G-70 or E series. In that way I could have the benefits of an arranger board along with any size-feel-weight controller (I have several) that I choose for a specific gig.
Ciao,
Jerry