I would give Plunge a potency of 500, put it on the GCD and give it a 50% chance to crit on hit. Plunge is the best thing ever. I look at the other jobs and all I see is an empty space where Plunge should be. I play as WAR and my first thought is "Fell Cleave is all very well but it's not Plunge". I'm leveling my BRD at the moment and you know what would make that job a million times better? That's right, Plunge.