In my opinion, I'd stay away from the PWC. Slow-tanking is great for twinks with haste and high ac. I'm assuming that's not you. Having the banded and other items will most likely help you more than a single weapon.
There are several weapons you could look for. You probably won't be meleeing much in groups though. Darksea Harpoon, Slime Coated Harpoon, Beetle Stinger, etc. If you grab the banded, hp/ac rings and a shield you will have enough survivability to get to 30+ in groups. Any weapon is fine to attack with until the tank gets aggro. I usually slowed early because my ac was good enough to take a few hits until I landed root or the tank took aggro.
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