DPS - Greater Essence

[Byteboy]

Is there any other greater essence worth getting besides the IPP Story Quest one(the one that gives 50AP)?
I'm thinking of just stacking 5 lessers and the 1 IPP Story Greater unless there is some other greater that would be worthwhile..

thanks,

[Dollwin]

The 50 shard BM one is arguably nice after the buff, and the 51 crit proc that self refreshes is arguable too.