2purcats,
The cattleyas are my favorites - http://www.crazyorchidlady.com/stores/viewstore.aspx?id...2&op=0&hint=Cataleya Their flowers tend to on the larger side and the ones I have for sale are fragrant as well.
The epidendrums would do well too. These are especially nice because you can hang them from the wall or window (they're smaller and don't weigh very much - I hang them from suction cups on my windows for an interesting effect). The flowers are smaller and more delicate. http://www.crazyorchidlady.com/stores/viewstore.aspx?id...op=0&hint=Epidendrum
Depending on the amount of light, the phalenopsis (commonly known as the "Moth Orchid") are nice, they have a rather large colorful flower and do better in brighter conditions. I have some for sale but don't have them listed yet, let me know if you're interested and I'll pm you the information.
I like my Vanda(s) - I have several in my private collection, one is over 8' tall! They require less humidity but more light.
All of these do well under normal house conditions. The more light the better, but just having lights on in the evening for a while is usually enough.
Note that orchids are much easier than "regular" houseplants to grow, requiring less care and longer lasting beauty. I've posted care sheets at http://www.crazyorchidlady.com/blog.aspx?tab=3
Hope I didn't over answer your question, I get a little excited when it comes to orchids, I think they are by far the most interesting group of plants on earth.
Nanci