Try either Angraecum eburneum or sesquipedale. Both of them, in my experience, are easy plants to grow and bloom. The caveat you'll most likely read about sesquipedale is that it doesn't like its roots tampered with; however, I replant mine regularly (every couple of years), and it has continued to grow and bloom reliably (that said, I will admit that I'm very careful to try and treat the roots as delicately as possible during the repotting). Eburneum will eventually get to be a monster of a plant, and once it reaches a certain period that's approaching adulthood it will also produce lots of "babies" around the base of the main stem which will provide you with a colony of plants. And best of all, eburneum's flowers are incredibly fragrant at night with (to my nose) a fantastic scent that's reminiscent of honey. Sesquipedale is fragrant too, but unless you're a fan of the smell of Noxema, the scent isn't really something to look forward to--although the flowers themselves are impressive. Both plants will tolerate the wide fluctuations in humidity levels you indicated, and both are warm to intermediate growers. Mine spend the summers outdoors and thrive on the heat and high humidity here in the Midwest. Then they come back inside during the colder months and live in the sunroom, where my humidity levels are basically the same that you describe. If, however, you can keep the humidity from dipping down to that 30% mark that you noted, I think these (and the majority of other) species will be much happier for you. And contrary to what you might read, they don't require constantly high levels in the 70% and above range. I think that over time a lot of orchids will adapt to less-than-ideal home humidity levels compared to what they get in nature--but 30% might be pushing your luck a bit. Good luck with whatever you choose to acquire from the wonderful angraecoid tribe.
Steve
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