While my division is not huge...it would be to large for me to mount for my growing area. The grower I got it from was growing it in a wood basket but I can't remember the potting medium she said she was using.
Izzie, I think your growing conditions would be similar to mine...I'm in Boise, ID. I have no problem with moss not drying out fast enough as long as the pot size isn't to large. I must admit though...I still can rot some roots in the stuff with my phals if I am not careful, but that is in a plastic pot though.
I'm really tempted to try the sphagnum moss...here is a link to the ebay seller that has the beautiful healthy divisions growing in sphagnum moss:
Laelia anceps percivaliana 'Nina Bonita' orchid species - eBay (item 190393519235 end time May-09-10 18:50:35 PDT)