Where are you primarily riding? A jacket that is great for Colorado-Utah, may not be so hot for Washington.
Personally, I go for shells and layer up appropriately. It's a little more versatile that way. For your base layers you might look at some power stretch fleece options. That stuff is warm and is great at wicking away moisture. Add a mid to heavy weight base layer and I doubt you'll be getting cold.
Still, there are plenty of jackets out there with light insulation that should work for you.