Even with the numbers for toggles for most armours in any powerset i wouldnt bother putting end recs in until the overall endurance cost of the attack chain is as low as i am willing to take it.
He will honor his words; he will definitely carry out his actions. What he promises he will fulfill. He does not care about his bodily self, putting his life and death aside to come forward for another's troubled besiegement. He does not boast about his ability, or shamelessly extol his own virtues. - Sima Qian.
..about the cost of toggles.
I have a ice tank and pretty much all his toggles cost (according to my builder) around 0.21. This with a endreduc SO in them.
Now I was checking brutes and trying to make a build, and as I browsed the different secondaries I keep on finding that toggles cost around 0.10 or 0.13, this without being slotted yet.
Even the vaunted /Dark, devourer of kittens and endurance, is showing as 0.10 for the three shields (though much more for the other toggles).
I don't see the point of putting a endreduc in these kind of numbers, to go from 0.10 to 0.8 is hardly ground breaking.
... or am I missing something?