Hi Worth, saw you on the PA1X videos and Korg Forums. Good to see you here.
Amongst my keyboards I have a PA3x and I understand entirely your views. The accompaniments really need a system that can reproduce the lower registers - you've got to hear (and feel) the bass and kick. I, too, was looking for that mythical beast, the all-in-one, easy to lift solution. SS3 goes about 80% of the way and I'm impressed.
Honestly folks, I can understand that if you're gigging with a bass player the SS3 will fulfill most of your needs but for Worth, who's providing solo accompaniment to a choir, and me, gigging solo for 24 years....well we need a bit of "wellie" (Brit speak)
Worth, get in touch with Gear4music, they do a 30 day return, and try a Gallien-Kruger MB112. If you don't like - money back!
I guarantee it will change not only your view but your percepion.
Meanwhile, Aspen, if you're watching, kudos! But please register me for a (sizable) early adopters discount on an SS4.