Dear Paphioboy,
I see it has been 3-4 months since your original post but I have only been a forum member for a month or so. To addres your question, there is a small yellow form of Coelogyne fimbriata. A few years back, in the RHS' Orchid Review, it was described as Coelogyne primulinum. Since then, Dudley Clayton, in his book on Coelogyne has lumped it in with Coel fimbriata. I have a Coel. primulinum which I bought in a tiny tube at the Melbourne Flower & Garden Show about 3 years ago. I think it cost me $8. In only about 3 years it has nearly tripled in size and has gone from 2 to 5 leads. Like finbriata they grow very fast and all over the place.
So is it a seperate species or just a varient of fimbriata? It looks for the moment like it is just a yellow fimbriata. Is it rare or valuable? I'm not sure. If you live somewhere where no one has it and people are willing to pay lots of money for one, then yes it is rare and valuable. If you live in Melbourne, Australia, you can go to Garden World and buy one for $8.
Regardless, it is a VERY enjoyable little orchid to grow. It is very easy and flowers 2-3 times a year.
Cheers,
-Kevin