I never said it had to seem like the miner had an ROI i asked for the best Gh to Wattage ratio. and the First one posted is currently the best if it runs at that wattage and Mining speed.
You asked for in part
the problem is i've been away for a while and i'm having trouble finding the best miner (50Gh-100)
So that makes it in lotto range. Best price is U3 but read about zombies. Best GH to power by far is doing multiple compacs and get enough for it to reach 50. (They get 8 gh easy on running, and 16 gh easy with oc and y cable).