I have a 2.5 GHz G5 PPC with HD3 Accel system installed. I also have 2 HD process cards sitting around gathering dust and could use more processing power for mixing (just a little short with HD3 Accel). I am tempted to buy an expansion chassis, but also realize my PPC Mac will become less supported as time goes on. It would be great to purchase a reliable PCI-X to PCI-X expansion chassis that could be converted to a PCI-E to PCI-X down the road so I have the option to upgrade to an Intel Mac down the road. Ideas and suggestions welcome. . . Thanks!