My personal preference is to have a bat as wide as the laws will allow, to help stop the ball hitting the stumps, but everyone has their own feelings on this.
When going down the custom route, all of this discussion is fairly moot, you tell the batmaker what you want and they will make it for you: full width blade, handle length, whatever you want. Will you have to pay $$$ for a true custom made? Of course.
Off the shelf it will be cheaper to get a harrow, but you do have to weigh up that generally they will be lighter and also narrower.