Going by your description you want to go with Champ. Captain doesn't really have much AoE potential (it's better in HD than before, but still pretty limited) and in groups is usually expected to offer support and heals rather than DPS. Guard could be an option, though at least before HD they were rarely picked as DPS in groups (and their default role is still tanking).
Used to play: 85 Champ / Captain / Runekeeper / Guardian, Guild Master of everything but cooking.
Playing now: Hellcat / King Tiger / GW Panther / IS / KV-5 / M4 Sherman and more