Hello to all

I am new in this forum, I have listened many good things about it, I expect to confirm them.

I have an old Roland arranger keyboard without disquete driver. I want to be able to use new styles, and my dealer offers myself three options:

1. To buy another keyboard. I want a keyboard for use at home, and especially easy management, but with a very good piano voice (or that permit importing it). My dealer prefers, in average range, Ketron XD9, then PA60, and then PSR2000, all similar in price.
Which of them has better piano voice, or if it does not, which of them permits to import and load external piano voices on the keyboard? (I like a lot the piano voice from my Roland kb)

2. To buy an arranger module and to connect it to my present keyboard, that I would use only as midi keyboard. My dealer knows Ketron XD3 ¿are there any more?

3. An opcion a little strange, perhaps. My dealer tells there are some programs to make sound yamaha styles on pc playing from a midi keyboard (as my present keyboard). I have read something upon the "Realtime Style Performer", and I have seen in a forum informacion upon it, that I put here: "The gives you the ability to play musical styles created for Yamaha PSR musical instruments via MIDI. The program is solely dedicated to realtime "live" performance with a MIDI keyboard connected to PC, like it is done by the auto accompaniment PSR keyboards. It is not a sequencer. By this the program introduces new abilities and does not cross performance of the other software applications and utilites available on the market, which deal with Yamaha PSR styles and MIDI."
Is that a real option? Is it possible to play a midi keyboard, and from it, make sounding yamaha styles on pc? Does changing left hand chords on keyboard change chords on yamaha style loaded on pc?

I will thank a lot all your sincere opinions about my questions.
Cheers.