Hi Shmuel,

X1 should be too heavy? And what about the PSR 9000? :-) I am allways swearing, when I have to bear it (I own a PSR 9000). It is extremnly heavy: 23 kg!!

As for learning curve I think the PSR 9000 is the best keyboard I have ever played. It is very easy to use and I find the layout of the controll button very efficient. According to the user-friendliness I would sort the keyboards I have played as follows:
1) Yamaha PSR 9000
2) Technics KN 6000
3) Korg i30
4) Solton X1
--------
137) Roland EM 2000 and G 1000

I did not understand, what did you mean by playing "with out a gap". With registration memory, you can play either without gap (if you recall during playback of one song the next registration) or with a short gap if you finish the first song, push registration memory and start the next one (max. 5 second gap).
If you meant MIDI playback, that is true, you can on the PSR 9000 to play back only song and then choose a next one. It is small drawback, but multiple MIDI files playback can be added in the next OS version. Maybe...
I think (I am not sure), that on the X1 you can mark many MIDI songs in one directory and let them play back. Anyway, you can choose the next song while playing the previous one.

All the mentioned keyboards have the ability to expand the amount of the styles (by purchasing or downloading them). Now I have much more styles than I will be able to use.

All the mentioned keyboards have either hard disk expansion possibility (Yamaha, Solton, Technics, Korg) or Zip drive (Roland). The PSR 9000 has the easiest harddisk expansion, as you can buy appropriate 2.5" harddisk in a computer shop (cheaper than in a Music Store) and install it (you do not need a technician, the installation is very easy). The PSR 9000 supports FAT32 filesystem, so you can copy data directly from a PC.

Hoppe this helps, happy hunting.

Marek