Squeezebox upgrade options for $500-600

I've just purchased a Squeezebox Duet system and am having it shipped to my house. I plan on upgrading the squeezebox as soon as it arrives. My budget for my upgrade is about $600 and I am considering two options:
1) Send the unit to Boulder Cable company and get the Enthusiest's Analog upgrade ($425) along with an upgraded power supply ($75 for the power supply and $100 for the upgrade). Total cost = approximately $600
2) Buy the new DacMagic d/a from Cambridge audio ($350) and get the squeezebox d/a converter upgrade ($250). Total cost is the same $600.
Lastly, my amplifier has balanced inputs and only the DacMagic option can make use of this.
I do not plan to use a preamplifier. My other equipment includes an Aragon 8008BB amplifier and B&W 802 series 80(F) Special speakers.