Hi Jaydiggity21,
I just started my vanda collection and just wanted to share what I've learned recently.
The other night, our orchid society's guest speaker is an AOS judge and grows a lot of vandas in his Half Moon Bay greenhouse. He grows them in baskets with coarse,
loose medium (to provide supplemental humidity) and pots (also with coarse,
loose medium); waters his vandas when they're dry (keep in mind that Half Moon Bay's weather is much like San Francisco's -- cool and mostly foggy).
His potted vandas, especially ones that have roots growing out of the drainage holes, are not repotted, but transplanted into a bigger pot with a small amount of coarse, loose medium (e.g. medium size bark/perlite mix) around the base of the smaller pot. The reason for doing this is to minimize root disturbance. If roots are long, he wets them down to make them pliable before placing in the new bigger pot. With the transplanting method, however, you'll end up having several pots within a pot that will look funky. If you rather not go this route, placing them in baskets and placing a small amount of loose medium around the base of the vanda is fine, but not necessary. Fog = humidity.
What your vandas will most likely need is bright to full sun and some warmth.
Another tip he gave us is that the closer you place your basket or pot to the walls outside will provide some heat.
HTH.