I'm so happy with my pro's I wouldn't spend extra to change/redesign them. Leave them the same, maybe stepped attenuators instead of rotating pots. Boost the quality, not the flashy, can't work together, features of A3d,EAX,(analog & 4channel, that don't support the s/pdif) or subwoofer input that is already delt with inside the pros?
If you want to put AC3, DTS,& a open source multi-channel decoder and mix down into the preamp, then I'll shell out more cash! Quick!!