I wanted to hook up a decent set of speakers to my QS but I cant get enough grunt out of the headphones socket.

What sort of audio cards (PC or mac) are available for this purpose?
I have a few old creative pci sound cards and am not sure if these might damage my mac or if they will even work at all.

Also would it be better to get a sata pci card or a ATA 100/133 one and will they even work at top speed on the PCI 66mhz bus?

just some general musings