Owens Corning R-13 or really any brand will do. If you're insulating exterior walls, you need to have a vapor barrier between the insulation and drywall to help with moisture. You can use a kraft faced insulation with the paper facing the inside of the room. Unfaced insulation and a 4mil visqueen used as a vapor barrier is typically cheaper than using a kraft faced insulation.
If you decide to insulate the crawl space, the vapor barrier is typically done a little differently. I would use an unfaced insulation in the floor joist, held up with a twine. I would lay a layer of 6 or 8mil visqueen on the ground.
Hope this helps.