Nice system- never thought about hooking a mac mini to the MDA1000- how does that work- optical cable? Very cool. I am using a Mac Mini with a Wavelength Cosecant and it kicks butt. One thing though is that I notice you are using a monster power conditioner to plug everything into- have you heard your system with out it? I have a feeling it might actually sound better with it out of the way- at least don't plug your power amps into them- they filter in stages which is great for cleaning the noise off the line, but in the process it limits current delivery. My system sounds better with out it!
-J