First of all, I want to thank you for replying to my question and giving me constructive advice (well, at least most of you...sorry, JCKeeys).
It is funny, however, how some of you reacted to my statement that I like G800 internal styles more than those found in G1000, which was only a part of my question.
Now, for the sake of discussion, let us assume that I am deaf and I don't know, but I still like G800 internal styles and I don't think there is a huge difference in more modern keyboards; after all, a bossa nova is always a bossa nova, right? Aside from Solton's sampled patterns, it seems to me that the more significant advances in style programming have been:
a- drawing more and more styles from actual songs and so, instead of having a preset called "Bossa 1" you will find another called "Ipabossa", and you will love it, because it was programmed by Tom Jobim himself!
b- a return towards simplicity, i.e. the so called "acoustic" styles, based on just a guitar or a piano backing your right hand.
Now, have you realized how you can change the flavour of a style simply changing a drum kit? When I am at home, I do it all the time, simply routing the corresponding midi channel of my arranger to a sampler or a synth module, and it WORKS! For some styles, like Dance, Fusion or Funk even changing a simple SNARE makes a hell of a difference! Freddynl is perfectly right when he says that arrangers are a compromise, but if he does not like the quality of his rhytm section, he can give them a whole new set of instruments, simply plugging in a midi cable and assigning the right channels (in the worst cases he will have to assign the right notes too, but at least Roland modules are already programmed according to the GM standard).
And the same thing applies for your right hand; those famous "cool" and "live" sounds found in Yamaha PSRs keyboards are drawn from modules like the EX5 and the Korg PA-80 will probably sound like a Triton or a Trinity, only scaled down.
So, the final sense of my question was: given that arranger keyboards are always a compromise, why drooling over phantomatic keyboards like Wersi or wasting a lot a money over the yet-to-come model, instead of keeping a still decent keyboard and implementing its sounds with a synth module?
I realize that this is an arranger keyboard forum, but music is music, after all.