I'm not much help, seeing as how my highest is *ding* WAR55, but I can promise with myself, a MNK and a THF, Darkspark will die in 1 round. Spinning Axe > Raging Fists > Fusion > Shark Bite > Light MB Holy (depending on stats) about 5500-6000 dmg, and instant death ^^
Send a /tell and if I'm not in the middle of G2 (which I highly doubt I will be) I'll be more than happy to come along.