Paphs would also do well in your conditions, but they'd have to turn you on. Otherwise, you have the major genera I'd suggest.
Hoa has posted several wonderful threads to consider with fall and winter-blooming Catts:
He keeps updating the second one, so only the first few pages will be in the season you want.
As for Oncs and Phals, there are so many that bloom in that season, and they themselves can get screwed up internal clocks. My Odontobrassia Kenneth Bivin, which has been a reliable bloomer in December for years, is now in spike! Go figure!
I'd suggest haunting a few good growers' sites in the fall and look for large plants in spike. If the vendors are reliable, that's a great way to get a large plant in spike. Otherwise, if you search for a particular plant, you may only be able to locate a small seedling.