Larrykell: Could you describe you search for a preamp and if you compared the Ambrosia to anything else?
Have you considered getting Ampzilla 2000's instead of rebuilding old SUMO gear?
I remember years ago listing to a friends Ampzilla amps and thought they were really organic, but now wondering if there would be a lack of resolution compared to what I'm running now.
The suggestions about the Squeezebox and upgrades are correct. Otherwise there are some DAC's with USB connections that are making great strides for computer audio. I used a Bolder Audio upgraded Squeezebox and Ultimate powersupply.
Love the system Mix!!