Monk : 2 jade mace or Wu's staff + weight penalty

[demonith]

Personally I'm a big fan of dual wield, however much of your DPs will be dependent on your level.

-From 1-19 jade maces will be the run away winner with the damage of the Wu's being capped at 20 then 28
-At 20-29 damage cap is 60. This is where you staff will shine.
-30+ cap is gone.

Most agree that 2handing it 30-50 is the right option, however its really up to you as the player. I had a jade mace/SoS till about 52 and swapped in a peacebringer here and there. However I almost always used the JM/SoS.

Things to consider:
-Faster primary will make better use of the damage bonus
-2hander will help mitigate damage shields / reposts
-2hander will make better use of you reposting

As for being concerned about your weight. With you having a fungi that will over ride pretty much any penalty till you are in your 30's at which point your weight allowance will be closer to not being awful.