For what you are talking about, I would go along with what Drew said about the temp electric at the build site. That for many reasons makes more sense.
If a generator is a must, for that long of a period of time, I would call the "Generic" folks. You might as well go big and get something to use as back up for the house. Will your house have propane or natural gas? See if either company can run a temp line for the Generic while you are building. With that said I would try and do the temp electric service. Much easier and maybe safer.
