the next step would be to see how many wattage this place can deliver, and how much is your investment
then you can go ahead and buy a s7, don't bother with other asic, as they require more wattage, which mean more psu
Avalon 6 has a group buy it looks like currently that might be worth looking at if stuck on 110/120. But your right if they are able to power the S7 it is cheaper as far as hash currently.
I think he needs to figure out the wattage like you said though. Unless his line is 220/240 I think one modern miner will use most of his "2 power outlets but are on the same power line"