Underlayer like Craft. Smartwool ... keeps your core warm when it's cold, wicking when it warms up.
Jersey of choice, mine would be short sleeve
Arm skins!
Vest.

This combo is like a jacket. Warm at the start, as you warm up on the road you can lower the arm skins or remove 'em. Draw 'em back up at a rest stop or if temps drop again.