(1) One S/S base t-shirt, like a 150wt wool.
(2) One L/S 1/4-zip mid-layer (like a Cap 2 Lightweight Zip Neck, around 5-7 oz). Layer this over the t-shirt if you are really cold and you aren't going to sweat too much b/c of temp or hiking pace.
(3) A windshirt.
(4) A down jacket for camp, sleeping if really cold. Think about the Montbell UL Down Parka, a piece I just got that is really nice. A few extra ounces for the hood.
(5) Mica or a Driducks rain jacket stays in the pack, unless it is a sustained rain.
Keep gloves, windshirt and hat/balaclava in an outer pocket of your pack and add these first as needed. Start with the windshirt in light rain.
Keep whichever shirt you aren't wearing accessible near the top of the pack. You get several combinations with the t-shirt, mid-layer and windshirt.
Keep Mica stored in the pack, bringing out in sustained rain.