I haven't tried this particular solution with SBLive, but it just should work (I DO use it with a Hoontech Digital XG card, but I've also got an external transport on the system as well). Instead of replacing the SDLive, get a digital I/O daughterboard. Hoontech makes one for the SBLive that's less expensive than Creative's (less than $30, IIRC). Run the coax digital output to an ART DI/O (around $127 or so at fullcompass.com). Run the analog output from the DI/O to the MG Head. The DI/O will have a higher voltage signal than the MG Head is used to, which means you'll have to keep the volume control lower, but this should give you a pretty nice digital source. As finance permits, you can modify the DI/O, or have someone like Boldercables do it for you. You could also switch to an external transport, should you desire. This strategy will give you a very nice digital source at reasonable cost, with several potential upgrade paths.