Well, I normally do BCNM40 runs with Deo. Ranger, Dark Knight, Red Mage can easily win it. If you spend about 5k on items (ie Ethers) it's guaranteed victory. Good drops too, Utsusemi Ni and Archer's Rings worth noting. Phalanx used to be good, but it's fallen a lot since then.

Now I make most of my gil off of the AH. I buy the -1 swords from Aht Urhgan (1000 gil each) and walk to the Merry Minstrel, where I sell them to an NPC for just over twice that. So fast, so easy.

That and the 1 gil game pays off.