I am in the process of building an orchid vivarium, and here's a small list of orchids that I've researched- Barbosella handroi, Bulbophylum laxiflorum, Haraella odorata, Pleurothallis corniculata, Pleurothallis ornata, Pleurothallis tribuloides, Pleurothallis grobyi, Angraeceum didieri, and Masdevallia Spp. BTW most of these can be found at
http://www.andysorchids.com/