paned windows

I am building a new home and want to make smart Green choices. I would love to go all the way but some green products are pricy! I am a first time home buyer and have a limited budget. We upgraded to double paned windows and more insulation. I can’t make anymore construction upgrades because it has been started but it is time to pick out furniture/appliances/flooring. What are good choices to make? What is the most imapctful??