Can someone give me the rundown on the difference between the Andersen 200 series, 400 series and architectural series windows? I've looked at their website and clearly the architectural series offers the most options but beyond the options for hardware, colors, etc. what are the differences? I'm trying to educate myself on the energy efficiency of windows so I'm guessing that is also part of the differences. Also, are there other alternatives to Andersen that you'd recommend?