Hi Marty, thanks for the question!

Depends on the area you live in. In our area I like Wolverine Glass or Carlson Glass. Look for a specialist who handles wet areas because you may want options that pertain specifically to showers, E.G. thickness, "color" , protective coatings, types of brackets/tracks/etc to hold it in place, whether it goes to the ceiling or not, etc. etc. Obviously you will want glass that is laminated and tempered so it is safer.