Hi Paul! I personally haven't tried the XE20. By "portable," what kind of size and weight do you have in mind? How many keys? You also mentioned the Yamaha DGX. Most if not all of these have built-in speakers. Is this a requirement? If so, how powerful does it have to be for the venues you have in mind?

I've also been mulling options for a lightweight, ultra-portable arranger. I'm NOT a pianist (strictly a LH chords, RH melody kind of guy.) But some brands might do better than others at having their styles "follow" the song when you play with both hands and no split. You'll have to get input from others on that aspect of these boards' performance. Good subject, following!!