I don't know where you are located, but you should grow species which is compatible with your condition and life style. Otherwise, you (or orchids) might not enjoy this hobby. I don't have a heated greenhouse, so I prefer to use pot culture, and I use mounting only for species which will do better on the mount. Mounted orchids look cool, but you'll need to provide high humidity, and frequent watering. Depending on species, you may need to water twice a day if your room is dry. If you have only a few plants, it is doable.
I don't know well about Vandaceous orchids, but you probably need fair amount of light for Aerides (probably more than Cattleya level). Can you provide it?
I've grown B. medusae long time ago, and it is a pretty easy species and I like the flowers. It is relatively common/easy to find species (so it doesn't quite fit with your 3rd criteria, but I agree that it is unusual looking).
Andy's Orchids - Orchid Species - Orchids - Species Specialist - Orchids on a stick is a good place to look for interesting/unusual species. Other place which have some Pleurothalids are
J&L Orchids ~ Home Page
Mountain Orchids, Orchids & Plants for discriminating tastes.
Other Orchids from Hawk Hill Orchids
If you need warm tolerant species:
Tropical Orchid Farm
You may find something you like there.