Okay folks, thanks for any help here. Right now i have an awesome setup but unfortunately i can barely use the internet, but it is a great sound machine. I have 2 m-audio cards.. one revolution 5.1 which runs digital coaxial cable to my receiver. The other card, an audiophile runs from my preamp from my record player into the rca jacks on the card. These are pci-x cards which will not work on the 4,1 mac pro i am buying. What options do i have to maintain my sound quality and 5.1 setup? I love my music and cannot do with a low grade suibstitute. Thank you!