Hi, it could be helpfull if you tell us a little more of what you want to do, expectations, projects, etc.....I do not like to compare, but is a little like cars/trucks......depending what kind of music you want to do, soloist, just studio, live performance, with a band, etc.-
Just for info, the Korg N264-364 are synths a little over 10 years old, the newer Korg series is the Triton, Yamaha the Motifs, Rolands and the Fantom X series.
And as far goes, the Yamaha S03 is also a synth, a little newer but, the DGX 203 is a low end arranger.....so is a little of mismatch...
Synths; provide you with a large pallete of sounds, from sound efects, etc. and most will include a General Midi Bank, their function is great to play in bands, studio, real time.
Worksations, like the synths, but include a secuencer that allows you to record your MIDI tracks, like a layer cake, strings, piano, bass, etc.....up to 16 tracks, some high end worsations will include a sampler too.
this are great for bands, studio, live performance ( band, unless you only use secuences).
The Arrangers, playing in real time with your chords will sound like an ensamble from a trio to a large band depending what kind of style/rhythm you pick.....this type of keyboards are ideal for solo players, singers.....duos. Most will have a large pallete of sounds, and the high end will have samplers, MP3 encoders, vocalist, etc. perhaps, features not available in worksations/synths. I hope it helps you this "explanation".
------------------
mdorantes
_________________________
mdorantes