You got a good price, Those look pretty cool, but the price that's showing up for me is $82 each. But it does sound like a better option for you with your bigger setup. I wonder if those would work well on an individual circuit as well (if you modified the power cable). Just thinking if people wanted to just monitor per rig or something. The watts up idea is really more of a replacement for people using a kill-a-watt that want logging (And cheap :-) ) .