www.customecos.com has advertised a really nice Epidendrum for an inexpensive price--should do well under your lighting conditions, and you can buy it already mounted on treefern or you can mount it yourself on the cork.
www.andysorchids.com has a great feature where you can enter your specifications to find suitable orchids they have for sale. You would want to choose a med to high light orchid under your lighting conditions, and an orchid that prefers moist to daily watering (due to the high humidity). Miniatures are what you will have to specify, as almost anything below 12" is considered a mini.
www.hoosierorchids.com has some nice minis also. They have a nice Saphrocattleya that I've been contemplating. I'll pull out my list when I get home. I would recommend Pleuros or Restrepias, but your lighting is far too intense for most of those.
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Homer W. Faucett III, esq.
Purveyor of Trivialities and Fine Nonsense