I'd be curious about a (2) S1 PSU solution, along with a (3) PSU solution.  I saw the 1300 Evga recommendation, but I'm curious about the price vs efficiency - if it is worth it.  The price on amazon is $200, which seems like a lot - maybe I'm mistaken

Saying to someone figure it out yourself - kinda defeats the purpose of a forum.  Searching provides some answers, but hey, the question is already asked, so let's discuss