Many people do "Under Observation" BCNM40, the peacock charm one. Although the drop is rare, it can be quite lucrative. It also drops Utsu:Ni, and Erase. It's also a 3 man bc, so it's easier to throw a group together.
Ideal setup is Nin x 2, and a Rdm or Bst. Alternatively, you can do this with Blm x 3. Since you're a Mnk, you probably have Nin to 37, so you can do this as Nin if you level it to 40.
But other than that, the Sahagin torque BCNM60 in RancorDen, Spectacles BCNM60 in HolarisPeak, and Rse2 Feet BCNM60 (Difficult) in Feiyin are also good.
I'm sure there are plenty other lucrative ones, but those are the ones I do.
Good luck.
Edited, Fri Apr 14 10:54:03 2006 by TaruVaxx