Let me say this about that. IF you want to be prepared, you should be putting in raceways.
Lets consider that the home will probably be used for 30+ years, and most likely 15 or so before really doing enough remodeling to justify holes in the wall for rewiring. So you throw Cat6 in now, that should hold you for a few years, but then what is next? Some nice plastic fiber to every room or something?
The problem with home wiring is that folks like to re-arrange the furniture, and while Cat5e or 6 is just sweet for data, what about all the other things that one wants to add? S video, component video, digital audio, etc.
So..here is the deal. Put in a mud ring at any location they need 'something' and extend a piece of conduit (pvc, emt, ent, whatever is easy) from that mud ring to an accessible space (crawl space, attic, etc.) Make sure you have a central place for all the wiring to come together like a utility closet or something, and stub a couple larger conduits into that space.
Ultimately it is nice to get residential panel and terminate the wiring in there.
Lot of things to choose here, but IF you have raceways in place, you can pull whatever media through them that you choose, even 10 years from now when we are using dacron string or whatever for our media.
Good Luck!
It is only my opinion, based on my experience and education...I am always willing to learn, educate me!
Daron J. Wilson, RCDD
daron.wilson@lhmorris.com