How to optimize legendary effects for the Dark Urge?

Well, my question is pretty much in the headline.

I'm running an Absolute Adversaries party with the Dark Urge as my main DPS. The party is roughly the same for Vajra and Elminster (ie. some combination of Gale, Lae'zel, Dynaheir, Karlach, Valentine, Shadowheart, Minsc, Jaheira, Astarion, the Dark Urge, and Wyll). My Dark Urge has level 7-10 legendaries, but I have no idea if the effects I have are "best in slot", so to say.

Is there a tool to calculate the best output and/or would anyone here have an informed opinion on what to go after? Reforging is kind of expensive and I'd rather have a checklist of some kind before rolling the dice.

EDIT: Thank you all for the tips! Byteglow's legendary tool is exactly what I needed.