If I had a two-story home, I would run fat conduit from basement to attic, as well as Cat5e to every room. And I would NEVER drywall the basement ceilings -- use modern decorative drop ceiling panels down there instead.

Our present house, designed by us and new 2.5 years ago, is single-story with walk-out basement. Multiple Cat5e drops to every room, and drop ceilings in those lower level rooms which actually have finished ceilings. Full access to adjust things in the future.

Cheers