Yes, you will be better off to buy one at least as wide as your tires.
You will get many opinions about box blades, these are mine.
The true benefit of a box blade is its ability to move material, this what it excels at. The use of it is improved dramatically with a hydraulic top-link. There is a learning curve to using one as they require constant adjustments.
You can not beat a land plane for creating a smooth surface with minimal effort. Because they have skid shoes/runners you drop it to the ground and allow it float as it does the rest to create a level surface.
I own a box blade and a land plane. To maintain an established driveway the land plane hands down wins.
If your driveway has deep pot holes you will want to get an implement with scarifier's to dig down to the depth of the hole to be able reestablish a smooth consistent base.
If I could only choose one it would be the land plane as it will move material just not as efficiently as a box blade, but then I always have my FEL to move material as well.