We are looking to buy 4 sleeping bags for our family. We all have some now, in various conditions and are looking to go lighter, either WM or Mountain Hardware. The question is, do we go with a 32deg bag or 40-45deg bag. We live in PA but will/do travel around the US, through spring/summer/fall mostly. Buying 4 bags is a big cost so we want to get the most versatile. Concerns would be too hot in summer and not warm enough in the shoulder seasons. Thanks for your input.