PC audio tweaks?

Alright - based on what I've read in this forum the last couple of months, I am on the verge of tossing my CD player and going to a server based system. Specifically, I plan to go from a G4 Powerbook to a Waveterminal U24 to my existing MF Trivista DAC. In fact, I've already ordered the Waveterminal and a Terabyte hard drive.

My question: are there certain tweaks to keep in mind in setting up this system? For example, should the the G4 and/or the Waveterminal be on an isolation platform? Points? Rollerblocks? Would the G4 or hard drive benefit from power conditioning? Should the digital noise of the G4, hard drive and Waveterminal be isolated from the rest of my system in some way? Is there any difference between one USB cable and another? Should I sprinkle all the digital components with Macedonian nun urine and sacrifice a goat?

As you can see, I've been thinking about this to an unhealthy extent. Anything you can do to straighten me out would be appreciated.