This is by far the best weapon for a DRK in the early levels. The DMG is great and the ATK+8 makes it better. Though, you can easily save your gil by doing the quest for this blade. Its essentially the same as the DRK quest(slay 100 mobs with the DRK quest GS)
Even though this isn't really expensive, you should still go and do the quest rather then toss the Chaosbringer and buy Deathbringer. The reason is that each time you use the boat in Palborough Mines, you'll get a CS and the Chaosbringer back if you tossed it.
Can get really annoying ^^