Get the E50 or MM6...

WAY cooler, way more contemporary...

Why not take the kid out to the stores and see what HE wants?

Alternative plan... look for a used E60 (they are so new it'll LOOK new). 76 keys (enough for most beginner piano pieces) a GREAT piano sound, loads of contemporary styles like hiphop and techno, VERY simple OS... cool touch screen (he'll love that!)...