Hi, I plan on purchasing new speakers when I receive my mac pro and wanted to know how good the built in sound card is. Is the sound card that comes with the mac pro any good? how does it compare to a sound blaster audigy? Can I upgrade the sound card on the mac pro or is that not possible? What are my options in terms of hooking up speakers to it? Could I add an external sound card or is the built in sound card good enough? Any info is greatly appreciated.