i would personally think that the 4 e8's would take more power..it's the same size coils, even if the sa8's are a little better thermally i'd think (with my experience of the e seies) that the e8's could take another 1200 if they had to, i have mine on a 1600, 2 of them.
exactly and they had said that the e8v3 was similar to the sa8v1 or 1.5 as in output but at a cheaper price