Custom sleeved power supplies
I bet you didn't even know you needed a custom sleeved power supply. But take alook around at performance-pcs.com and you'll find out why you need one.
Start with a high-grade power supply, trick it out with expandable cable sleeving in coordinating colors. That's just the thing to go in your showcase PC, or in a clear case.
Plus check out the line of wire management goods they stock. Gotta get the inside of your rig looking as tight as the outside. Hell yeah.