For targeted hunting, the best pure single target DPS i'd say are 100% Elemental Crimson/Platinum Drakes with Chiv+AI, assuming their damage type matches the victim's weakest Resist. They aren't particularly tanky though, so require external healing.
For general purpose killing, Chiv+AI Tritons with high Wrest (over 120) are also really good at single target DPS, while also being pretty tanky at the same time. Chiv+AI Cu Sidhes are good at general purpose hunting as well (not quite as good as the Triton though), but have the benefit of being ridable. The new Moldering Ursine is another flavor of a good general purpose killer, just with a different healing mechanic (Life Leech) that scales with his damage output, so Chiv+AI. The Moldering Ursine is also capable of extreme damage output when under Berserk. Chiv+AI WWs (pre-patch) are also good general purpose killers (but require external healing).
For AoE DPS, i'd have to say the FWW+PB Najasaurus is king. Aim for a 2 slot Najasaurus with 190+ DEX (max movement speed) and 170.0+ Resist (188.0+ when wild). Tritons can be made Poison+FWW+PB as well, but they'll FWW/PB less often due to spending mana on Healing, and they're susceptible to being Poisoned (unlike the Najasaurus, which is completely immune), which can interfere with healing attempts on them (especially when they're surrounded by mobs that can poison).
For general debuffing, the RC+AP Fire Beetle (or Giant Beetle) is great. The Frost Mite will use RC/AP slightly less often due to also using Cold Wind, but their stats are insane (when they spawn as 2 slot), but they're not ridable. You could use a Rune Beetle for Disco+RC, but they're pretty squishy and cramped for points. The Disco+CB Triton is king for amplifying a Death Ray Tamer/Mage's © damage output.
For a heavy Tank (like Exodus requires), the Feint Triton is king.
For pack pets, the currently spawning Shadow Hound is king. A 5 pack of Shadow Hounds can deliver insane DPS, but are fragile.
