[moses]

I've got a bunch, but can't be bothered to post links for each and every one. That's what Google is for, right? Anyhow:

Aerial View - proggish hard rock
Ajalon - really good
Akacia - sounds like vintage prog
America Gomorrah - prog metal
Azure (Circle) - old Genesis lite
Cryptic Vision - like a heavier Kansas
Divine In Sight - Rush meets Queen
Echolyn - they're on the station
Farpoint - folky prog, also on the station
Glass Hammer - keyboard driven in the ELP/Yes vein, new album is awesome
Groves - Carl Groves from Salem Hill has a solo album
Iona - well you know... really awesome and beautiful stuff
Kansas - like you said, sort of - some of the 80's output
Livgren/A.D. - Kerry's solo stuff
Morse, Neal - I think it's some of the best prog out there
Proto-Kaw - Kerry Livgren's new/old project, very good stuff
Pursuit - prog metal, mentioned above
Revelation Project - prog metal
Salem Hill - they're on the station, great band
Saviour Machine - scary goth prog
Simon Apple - poppier prog, very well-crafted
Spock's Beard - well, just the Snow album really
Ten Point Ten - another of my favorites - great stuff!
Wakeman, Rick - hit and miss, like you said

Those are the ones I have that come to mind right now.

They do vary on how strongly they display their Christian message, from "very veiled" to "in-your-face" but most are somewhere in between.