You might want to think about putting a few outlet boxes in key spots where you think you may put speakers, computer desks etc. For each of these boxes attach a piece of PVC pipe (or other conduit) running all the way from the top of the box through the header at the top of the frame (passing through any fire breaks etc).
With that done you can run whatever wire you want later, be it Speaker Wire, Cat-5 for computers, Coax for CATV and cable modems etc. All you need to do is go into the attic, find the right pipe and fish the wire down to the box (having the PVC pipe makes this easy). This way, you can put off the wiring decision until later. It also lets you change the wire later when you want to upgrade from the original Home-Depot wire to the $300.00 per inch kryptonite-oxide insolated solid uranium MegaCable (after you take out the second mortgage of course). Just pull out the old stuff and run in the new stuff.
I have seen this done and it works out quite nicely. You just need to give some forethought to how you might use the rooms in the future.
