You could also consider necro.
You may not be invaluable to the group, but you can support it very well with heals/mez/manafeed. Add constant dps with pet, cheap to gear up, makes money easily.
You wouldn't be the most important person in the group, but you would be welcome.
Another option for a support is the ever popular shaman, as long as you don't mind spending most of your time casting cannib.
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