Just put a box on every wall and drop down a 2 foot section of smurf conduit into the crawl. Then u can run whatever u need to in the future.
As far as the spots where u know u will have something, I recommend two RG6 and two cat-6
Definitely would be better putting some kind of wire channel that would allow you to fish whatever is needed when it is needed - chances are connectivity requirements will change many times throughout the life of your house. I would also suggest putting the largest reasonable size possible (1" to 1 1/2" would be good) with as few bends as possible (a straight shot to the crawl space or attic would be great).