We started out with twist on attachments that mounted to the ceiling framework and provided a 1/4 inch stud, added a barrel nut and a bridle ring. All came from the local electrical contracting supply house, and were inexpensive, plus it all goes together with no tools other than a step ladder to reach the ceiling.
We we moving into a very large open space with a LOT of equipment to be interconnected. I managed the effort, and the one thing I was sure of was that the floorplan would not be what we imagined once we got used to the new space, and that it would be fluid over time. The bridle rings let us get the cables overhead and out of the way, but it's very easy to change things up, either by adding/removing cables, or rerouting them. If you need to go off in a different direction, it's a simple matter to add more rings. If a particular ring is no longer needed, simply remove it and the barrel nut, leaving the (unobtrusive) stud fixture in place for potential later use. They're cheap.
The intent was that as things stabilized over time, a "backbone" would emerge, and we would replace the bridle rings on the stable portions of the network with product from these guys: http://www.snaketray.com/ , with the idea that we could unscrew the bridle ring and barrel nut, and then hang the snake tray from the same attachment hanging from the suspended ceiling framework.
As it turned out, we never got around to that upgrade, as the bridle ring lashup worked very well for us. I no longer work there, but the approach I describe above worked for ~10 years.
The other option to explore is some variation of raised flooring. It does not have to be in the mode of the old machine room, 12 inches or so above the base flooring...... there are companies that sell what are basically interlocking floor mats with cable channels and removable carpeting tops. Looks like regular office flooring, but houses your cabling.
Hope this helps.....