Danny,

It depends on whether you want to shoot wide angle only, or also shoot macro which really requires lights.

The lights are a big ticket item, that is why I asked. A friend of mine just bought an Amphibico housing and lights for just under $3500, he already had the videocam.

Look for a good quality optical dome port. All the major manufacturers of aluminum housings, Amphibico, Gates, Light and Motion make good housings and have good dome ports.

If you don't want to bust your budget, the Equinox housings are good deal. Equinox has their own manufacturers forum here, post something there if you have any Equinox specific questions.

Make SURE whatever housing you get has a white balance control! I would not take a housing for free without it.