If you really have to narrow it down to just one, I would probably be considering some type of zip up coverall that is big enough to layer underneath for colder temps, but light weight enough for those 70+ degree days in early season. If they're big enough, you can cover a multitude of layers underneath without worrying if you're cammoed well enough. If you are narrowing it down to just one pair, I would probably further look at one of the water repellent brands. That would keep you out in most any weather. The trade off is that it will be a little warmer in the early season.