The Surface Pro 3 is a magnificent device, but it is also a pretty hefty investment, regardless of which model you get. For that reason, you want to protect it as much as you can. A good case or sleeve will get you far. However, you may want to go that extra mile and get yourself a screen protector as well.
The BoxWave ClearTouch Ultra, anti-glare screen protector, has some admirable qualities, but it may not be for everyone.