Hi Becca,
I do not have (yet) orchids in my office, but can tell you what my colleagues have. You would be impressed with the amount of Phalaenopsis and Dendrobium (Phalaenopsis type) you can find in our offices, more impressed to see how good they do it there. Both groups are very popular in offices and windows hills both in Germany and Switzerland, and normally you can buy them in almost every supermarket
In this link (unfortunatelly only in German) you can find several Phalaenopsis Hybrids that are recommended by the Schwerter team for window hills and office environments:
Phalaenopsis Hybriden Orchideen und Orchideenzubehör der Schwerter Orchideenzucht This nursery is very serious. I am not really sure if it would be worth for you to order from them, but at least you can have a look on their sortiment and try to find your favorites in the USA... I am not very much into Phals, but I have to admit that these two are gorgeous and will probably end up in my office some day: Phal. Memoria Liu Jin- Chyuan'KF#3' and Phal. Mini Mark
A colleague also has an Epidendrum ibaguense since one year and it grows like crazy (including many keikis), however it has not flowered again yet...