I need to buy a PCI-Express sound card with an optical output that is compatible with Snow Leopard... Failing this a USB Sound Card also with optical out that works with Snow Leopard would be fine... It only needs to be a fairly cheap one (around £40-50), but I'm having real trouble finding one!! I'm not really a Mac person so thought I would post on here to see if anyone could advise something? Cheers guys!