That's sort of tough to answer. We have a few dedicated healers right now, so I'm leaning towards DPS. We had a few weeks where we were getting like 1 healer and having to pug the rest, so a bunch of people leveled up healers. I know we have Gurga, Alavaz (JTheRuler here), Faizy, a shaman that is newer so I can't remember the name, and probably others. Alavaz, Faizy, and Gurga have been there every week. As I'm typing this I would say lean towards DPS, if shit hits the fan we can see what we can do.
That said I always tell people to play what they enjoy (besides tank, we have a few on backup already). We can always fill the rest.