I am with dan on that one, you might want to clarify the 2x PCIE connectors portion, There are PSUs that have 2 PCIE's but one plug is jumped from the other, which I did find can cause issues (hence with my earlier posts, I made a 2 4 pin molex to 6pin connector to relieve some of the heating issues, which later bit me in the butt, but its all resolved now with a corsair Cx600...

)....
But I really really liked your guides, and I did your survey online....GREAT JOB!!! and super useful!!!
I usually do require that, but for the Cube 300W isn't a problem. This is what 2xPCI-E 8pin on one cable are designed to run at for GPUs and so the cables can run a bit higher than that without problem.