I have been happy with this one: http://www.rockler.com/dust-right-2-1-2-expandable-shop-vacuum-hose-kit
I went into the local Rockler store and played with all the hoses they carried, and this one has the best flex; much better than the Shop-Vac brand that I originally purchased.
Note, however, that it wants to be fully collapsed at rest, so you will probably have to hang it in some way to keep it extended. I made my hole in the top of my enclosure, and the hose just drops down through. I anchored it at the hole, though, so that I didn't have the full 12-feet of hose inside my enclosure.