I second the suggestion of smurf tube (or better yet, real pvc or emt). make sure to use 1" minimum, and double up runs to A/V centric locations. Don't forget short hops for rack-->plasma/projector runs, etc, in addition to home runs to the wiring closet..
RF is great for some things, but I would not use it for everything. It's not the cure-all that some people make it out to be. It does have it's uses, both cabled, and free-space.
Phone: RF is great, but don't forget jacks for satellite receivers, fax machine, modem, etc
Data: RF is great for roaming laptops, but I prefer to keep desktop machines wired for speed and security reasons. If you are using a media server, streaming over a network, go ethernet, not wireless.
A/V: RF works if you're just sending a signal to a crappy TV, but you are never going to have the resolution and clarity with current technology that you will get with a direct audio/video connection, especially if you are used to using component, or Y/C (S-video).
You can get baluns to let you run A/V signals over cat-5, with better quality than RF.
The one advantage that RF has for A/V is the ability to put multiple signals on one cable, such as multiple cameras, multiple A/V sources, etc, so it is certainly valuable, but it's not a cure-all. I would run it everywhere, in addition to baseband, but not as a replacement for baseband. RF over cable is good for distributing stuff to places where you wouldn't otherwise have a dedicated connection.. It would be worthwhile putting every A/V source, camera, etc in the house on a channel on a in-house cable system, so you can watch anything from anywhere.
Alarm: RF is ok, but I prefer a hardwired supervised system.
Cameras: RF works, but remember that with many of the systems, anyone can tune in, and watch your cameras. If you are using IP cameras, I don't think they offer that much more in the way of security. I prefer hardwired back to a central location, with power supplied from the closet, and distributed from there, possibly via RF on cable.
Remember that all these devices require power of some sort, and I find that it is much easier to hardwire, and provide power from a central location for those devices that need it (cameras, etc) or eliminate the need to provide power to the remote location at all (alarm).
Personally, I'd drop a pair of tubes to each desk/rack/cabinet location, and drop in 6 cat-5e cables (2 voice, 2 data, 2 A/V) and a RG-6 or two to start with, leaving a empty tube and a pullstring for later. 2 gang telecom rings or deep 4-11/16 boxes.
Don't forget ceiling boxes for projectors, etc, and some boxes high on the wall for wireless access points, cameras, alarm, etc.
Don't forget floor boxes either..
For the A/V centric locations, beef up the tube size, and add some more spare tubes. Run a couple of dedicated power circuits.
If doing an A/V room, consider putting in a subpanel + power conditioner just for that room.
Planning something like this takes foresight, and while it is tempting to spend $$$$ to wire for all the new whiz-bang technologies that you might buy someday, it makes more sense to put in lots of tube, and wire for what you need today + a couple years, and have capacity to pull new wire as needed.
For now, I think that a good base of cat-5e and RG-6 with patch panels makes the most sense, along with specials as needed for specific rooms.
[This message has been edited by techie (edited 01-01-2006).]
