I need to replace my Windows HTPC with a Mac. The problem is I need a PCI slot as I have a rather nice high end audio card I need to use. Do I have any options other than a Powermac G4 / G5 / Intel? Or are there any mods that can be made to other macs that will get me where I want. My current HTPC is in a nice desktop Silverstone HTPC case and it would be nice if the mac could look as nice.