Yeah, they are similar, Fran...I believe the Yamaha would hold it's value better, if he ever decides to trade up at some point.

The 635 has more features but the 88 keys are weighted hammer action, which may not be what is wanted...and you're right, it's not exactly "portable".

The second hand Roland E-60 would be a great choice, as you say...a lot more arranger and better piano as well...but could one get one for around $1000?