Best potting mix for an Odontoglossum

[kflickin]

Hi, I have a young Odontoglossum that will need to be repotted in the next month or so. It is currently potted in sphagnum moss. I was wondering if anyone knew what potting medium is best for this genius. I live in Colorado so it is pretty dry here, it currently is in my office but I might put it in my greenhouse in the next couple months. Any information would be great! Thank you!