So the Korg Soundbar for the PA3X isn't an option? It seems a shame to have to use a poorer sounding arranger, simply because you don't want to tote the soundbar (or get a case that fits the Korg while the bar is attached)...

Something else to consider might be in ear monitors. If you use the standard 'sit on the ear' type buds, you don't stop external sound getting in (as the full seal in the canal types do) so you don't lose audience interaction or an awareness of how hard you are hitting the room, but clarity of what you are playing and singing is just about perfect. The Bose sub will make them sound full, and as to weight to tote around... LOL

I always keep a pair in my gig case, in case either I have no time to set up the Mackie hotspots, no room, or the room is too quiet to use them! They have saved my buns on several occasions.