Steve's Factory Manager, while not as pretty as most of these systems, absolutely crushes every single one of these mods. The utility and flexibility isn't even close in terms of precision and speed. The server load is almost nothing even compared to TE3 itemducts.
Watching the video on it right now, I can tell you very specifically why that is, in terms of server load. It is because SFM moves almost all of the work involved, from the computer to the user. That is not intended as a criticism; simplicity in almost every case is defined by how much you're willing to do manually, and from that point of view, this is great. SFM is essentially Pfaeff's Allocator on acid.