We received two estimates for the shower enclosure. One is from a local glass shop and the second is from a shower door specialty shop.
Both estimates were close. I was surprised at the cost, but it seems that if you want sleek and trendy you will pay a premium. As Jeff says, after all the money spent on the travertine and installation, you want the beautiful tile to be seen.
After discussing the estimates, we have decided to go with the shower door company. In talking with both companies, it seems that installation is critical or the shower will leak. Since there is no frame to join the glass pieces, you need an exact fit or you will have puddles on the floor.