Thanks guys... much appreciated. Acrylic/plexiglass is a nice option, as it's much lighter than glass. I might switch over to that in the future, as I often worry about the overall weight as well.
I've always used UV glass in the past, but honestly think anything is ok as long as you keep them out of direct light. I would go with those 100% "light-blocking" UV Blinds on the
windows, and then use whatever type of glass or plexiglass you prefer. The window coverings are probably even more important than the glass