Media for indoor low humidity?

[gdupont]

I'd love to hear some discussion about how to best grow the unifoliate species indoors (low humidity ~30%, usda zone 6), particularly in terms of potting media.

Ive had an okay experience with sphagnum in terra cotta pots with packing peanuts on the bottom, but I'm learning towards trying plastic pots instead. I'm guessing I should definitely stay away from the leca-in-a-mesh-pot approach that folks in Florida use!