Wart removers and power squids just look like they'll make the rack look really messy. I really want this to look nice and clean.
No. Squids, yes, wart-removers, no. The wart-removers mount flush and solid to the rack. The small wires from the warts to their units can be run through any of the various wiring harness products you want to use. Very neat and clean.
Even I can do that......
There is also a plastic "coil"-type product which will suffice. I just can't think of what it's called or find a picture, but I've seen it used to corral multiple power cables in offices with computers, printers and the like. But once in there, it's kind of locked up. The wiring ducts will give you more flexibility for adding/removing wiring.