[JavaBrewer]

As for the grout I would think a standard sanded variety should be fine. I really don't know if there are grout additives but I'll bet KT does. Don't be afraid to go with a lighter color grout (if that is your first preference). As long as you seal it with a high quality product you shouldn't have any problems with staining or discoloration.

I like the river stone as an accent. I agree with KT that it would be hard on the feet if the whole floor was done. Something to think about if you ever decide to sell your home...