Thanks, Pika. I've printed out your list for reference. I have that same Montbell down jacket...I think it's the "down inner," right? Mine is 6.6oz including the stuff sack that came with it.
I've carried it instead of the heavier down jacket, but always had a fleece, too. In combination with the Marmot windshirt, it would be about the same weight as the Alpine light jacket, but more versatile and windproof. The Marmot windshirt, BTW, is seriously windproof. Super light material, extremely tightly woven. I wish I knew where to get some. It's a zip-front shirt, with no pockets, so I added patch pockets. I may add lycra binding around the bottom of both the windshirt and the Montbell down inner, making them more jacket-like.

Using your list, your warmest option would be zip-t, long-sleeved shirt, down inner, and windshirt. Will that keep you warm while inactive at after-sundown temps in the Sierras?

I have those shoes, too smile
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Always remember that you are absolutely unique, just like everybody else. -Margaret Mead