i recorded a concert the other day on my pro tools hd rig. i bought a presonus digimax D8 to add 8 pres/converters into the digital in of the 192 and was very pleasantly surprised with how good the digimax sounded. I'm about to order 2 more just for live recording purposes. i have looked around alot and those seem to be the best value in my opinion. i have never used the other units your asking about though.
Paul
www.paulleavitt.net