Need Audio Card Suggestions - Logitech z5500

Hi. I was using an M-Audio Revolution 5.1 to drive my Logitech z5500 speaker system... until 10.4.10 made the driver obsolete. I changed to the M-Audio delta 2496 midi card, only to discover same driver problems: kernel panics and, much less concerning, hard drive can't go to "sleep". At the moment I have no sound card and, consequently, cannot drive the speaker system.

Any suggestions for a card for my setup?

Thanks,
Paul