Probably Dendrobium nobile. A lot of nobile hybrids look similar to the species and each other, but in flower shape and growth habit yours strongly resembles the several examples I've seen of the species. In any case you've got a really nice plant. Any fragrance to it?
If you're interested in books about the genus Dendrobium, there are a couple of good ones by Bill Lavarack et al, and Howard Wood (the Lavarack one is a lot more affordable). Charles and Margaret Baker also published an excellent culture book for Dendrobium species, though from the looks of it you've got the culture of this one down pat! Nice growing, Lori!
--Nat
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