In your lower humidity you're going to have a lot of trouble with C. aclandiae and schilleriana.
So I have Tigrinia-- what about Dowinia and bicolor-- those are some favorites of mine too.
Anyway, also is it a matter of tweaking the environment-- for instance, my latouria dendrobiums are a slight bit accordioned at times due to the lack of humidity. but they are healthy and the flowers are great.