You might consider letting us know what type of music you intend to mostly play, what are your favorites, whether you are an experienced (if out of touch) synth and MIDI programmer or just a 'turn it on and play' kind of guy.

All of those things can influence a recommendation. Certain arrangers play bigband best, certain play smooth jazz the best. Some are best at Latin, some at Rock, etc., etc....

Some are easy to operate, others take a cerain degree of expertize. Some excel at Asian and ethnic styles, others don't.

There's a multitude of 'bests'...

Best at WHAT?