Summoner and Scholar... though outside of PVP my main class progression-wise is Bard followed by Summoner, and it's Bard and Dragoon that I'm buying Hellwolf gear for even though I don't PVP with them. Got lvl 34 last night so I'm finally able to equip some of the stuff I bought many ranks ago before I capped on Wolfmarks.

Generally I start as Summoner because I can wreak the most havoc on that class. If I join a team with no healers or just one, I'll usually go SCH and do well enough there, but if I get a party that is too busy chasing around their own lone targets out of range of the objective and can't be bothered to go after the one target in a group I mark/announce as being the main interrupter of my healing spells- the way I look at it is I queued in as a DPS and I can sure as hell swap back to being a DPS. It's not too often I get a party that bad though where everyone's treating it as their own one-vs-one PVP encounter and expecting me to chase them out of range of the flag to heal them. But sometimes I will go on 'healer strike' and only do SMN when I've had enough.