Flatfoot,
The remarks by Jus are right on. Go for sound quality over the silly teaching tools. There is nothing worse then trying to practice (even doing scales) on an instrument that sounds so bad you can't continue. A flute that sounds like a vacuum cleaner blowing through whistles. A piano that sounds like thumb tacks falling on rusted quitar strings.
Unfortunately, the only tutorials that I've found are for piano, not arranger keyboards. So I'm learning piano, in the hope that the skills are transferrable. An arranger is played very much like an organ (for solo performance). Chords in the left hand, melody in the right hand.
Starkeeper