Proper pot size for kingianum?

[T0dd]

I was cleaning up my fledgling orchid collection today and decided to repot my Dendrobium kingianum. This is the first orchid I've ever had any success with, and it seems to be thriving, having shot up three pseudobulbs in the last 3-4 months, each one taller and fatter than the last.

I ordered a small pot for it several weeks ago, and haven't had the chance to repot, so I started to do it today. As soon as I pulled the plant out of its current pot, I was shocked (in a good way) at how much root growth had occurred. The bark and moss were held solidly together by a mass of healthy-looking roots.

But now I'm thinking the new pot might be too small! I know I've read that some orchids do well with ridiculously cramped pots, but I don't know about the kingianum specifically. What do you think? Is this a reasonable new home for it, or should I go bigger?