Unfortunately option 3 is not available.
Power company supply voltage is 120/240 single phase to a meterpole located 100' from power company power pole.
From there we have to take it all the way to the new single family residence.
So we really need to see wether we want to stay at the supplied voltage or bump it up at the beginning of the run only to bring it back down at residence.
Its definitly cheaper to do transformers than using 3 #600MCM cu wires to stay within the code recommended 3%drop limitation.
Long term costs are a lot more difficult to predict
