Do yourself a big favor and take the Airport Express out of the equation. Yes, either get a USB converter, or get a USB DAC (which essentially puts the converter in the box). I've tried getting good sound from an AE but could not (flat, narrow soundstage, and not very engaging). I did not like the HagUSB device I tried out. I liked the Waveterminal U24 very much, but their not available anymore. Check out the offerings at Empirical Audio. He also does some mods to the Benchmark that may interest you.
Love your light bulb idea...and the movie projector thing, well you rock dude! Keep up the great work!
Marco
Love your light bulb idea...and the movie projector thing, well you rock dude! Keep up the great work!
Marco