hello my name is jack, I am in an experimental electronic band called MODIFY . What do you want out of a synth ? If you want sampled instrument sounds it doesn't matter what you by because all the manufactuers want their keyboards to sound realistic. If you want to be unique you might try some older Korg synths like the DW6000, DW8000, DS-8, POLY 800, DSS-1 ( that ones really cool ) . These synths all have MIDI , let YOU create your own sounds with ease , and most of all you can get them cheap compared to the over priced pre-set casio like I series and N series or the M-1 and all of it's spin offs.