new windows/old home
There is alot to cover here. First- economical windows is a fancy word for cheap. These will present problems down the road, especially with the weather you are subjected to in Maine. In a few short years replacement windows generally begin leaking air and causing condensation to drip all over your woodwork and walls. By spending a little now, what will it cost you to replace the windows again? This is one of the few areas in life that "you get what you pay for" is true. My advice is to buy quality even if you have to space the window replacement over a few years. Do one or two sides of the house at a time. The better manufacturers do not change their traditional styles very often so matching should not be a problem.
In the 18th and 19th centuries, it was very uncommon for windows to be very large. The manufacturing process was not that refined (many people still will not part with those wavy windows). As a result, most windows came with individual lights to them. Depending on the size, they were 6, 8, 9, lights or whatever it took to fill up the frame.
If you were to pay a visit to your local historical society, or library, you would probably notice from the pictures how your home once looked. So you are probably just returning the house to the way it once was. The only important consideration to keep in mind is to keep the total look as one. All of the windows should look like they belong to the family. Don't mix double-hung with casement, never by sliders, if some have individual lites then they all should, etc.
I hope this was what you were looking for, since I usually do not type this much. If I missed the mark let me know, I won't be upset (too much).