White grout, aieeeee. Oh, no, arrrgh! The horror! Anyway. Be careful about anything called "super-white" because those often tend to have neony yellow tones to them. Also be careful of grays, because they may have different undertones that must match the other tones in the room--greens, pinks, etc.

The TCNA standards; for all grout joints 1/8" and over use sanded grout. For all grout joints 1/8" and under, use non sanded. You can see at 1/8" you have a choice. Where possible we always use sanded grout as it is stronger than non sanded. Have you looked into Fusion Pro (Custom Blend), Plasma (Laticrete), or Flexcolor CQ (Mapei) as a grout? They are virtually stain proof and require no sealing. SUre they will get dirty, but the color will always be perfect.

I know that yogurt commercial picture is tough to really see the grout. But any suggestions for a good light tan or simply off white grout color to use?

Yes!! Whether you have tile grout problems or you simply don't like its color, it is possible to change the color without tearing out all of your tiles. Hire Precious Tiling to get this job done, it will be easy and quick.