By the way, with regard to the follow-along visual lights above the keys, this feature shows you what key to press when playing along with the built in songs and it will even wait for you to catch up. That is a fun feature and can be useful in the beginning for adult students and children of all ages. But at the end of the day, teachers generally don't like those things and it can create bad habits for younger students who take lessons and want to progress upward into new skill levels. However for adults (and very young children) who just want to play for fun and get music out of the piano as quickly as possible, the follow-along light system definitely makes that happen.
You might also want to be aware that Yamaha has their Clavinova CLP series which is Yamaha's more traditional digital piano without the big screens, automatic chords, lights, etc, etc. But the new Yamaha CVP 600 series has the new improved piano sound and other features of the new CLP400 built into those CVP models along with big touch screens and added interactive features, but they are much higher priced.
I have also done an in-depth review of the lower priced Casio PX780, so if you're looking to get into that lower price range, then check it out at this link: Casio PX780 review