BLUE SKY THINKER,
For the SPDIF, the only way to go is the:
Logitech THX Certified Z-680 5.1 500Watt Dolby Digital Speakers:
(But at 40+ lbs you will need some endentured servants to carry it around for you.)
A good low end set of speakers are the:
Logitech X-120 2.0 Speakers:
Then there is something like the Cyber Acoustics 2-Piece Speaker System. These passive speakers have no amplification:
(But they are not much better than the integrated speakers in your Notebook.)
Take Care,
Richard