Wait a minute now. If you are a piano player, you probably should buy a piano. Arranger keyboards are made to provide automatic background rhythms and backup instrumentation while you play fills and lead instrument lines with the right hand.
I use fingered pro chord mode on the PSR9000 and sometimes use a vocal, string or organ sound on the Left voice, use a piano or guitar sound on Right 1, and layered strings on Right 2. I have not yet run out of notes. I do not even know if the one-finger chord mode works because I've never tried it, but I'm sure there are lots of people you do use it. I've made enough money using arranger keyboards that I haven't had a "real" job in 25 years, so by definition, that makes me a professional. Just because I don't turn off the arranger and play the bass lines myself, doesn't mean I couldn't, it just means that's not the way I prefer to do it. And I believe that's the way the majority of arranger keyboard users play.
I suppose you can layer enough complex sounds to run out of notes if you try, but I maintain the primary purpose of arranger keyboards is to make one person sound like a band. All of them do that pretty well.
I particularly like the way the 9000 functions in live performance. The buttons and screen are logical and functional. It recognizes all the chords I know how to play. I seldom use Full Keyboard mode, but haven't noticed any polyphony problems when I have.
I didn't like the way the X1 was laid out or the fact that I was afraid it would not work when I plugged it in.
I couldn't get some of the sounds to work right, and I understand Tom has had more troubles in other areas. Also many of the others on this forum have commented on various problems with the X1. I'm not talking about minor "bugs" but major problems that prevent you from playing the keyboard. One guy in Europe had his replaced three times.
Yes the X1 sounds great, but that is just one factor among many.
Again the bottom line is--go try all the models you can, and find the one that fits YOUR purposes. Don't buy one because I like it or because Uncle Dave likes it. Get one that does what YOU want it to do.
Nothing wrong with getting everybody's opinions, just be sure you place your own opinion first, because you have to live with the results.
DonM