So I got a vest, a Patagonia Micropuff. No, I did not pay anywhere near the list price, or even that sale price. It may not be the lightest, ,maybe not the warmest - but hey, I'll take it.
It layers well under my Thermawrap parka, and is warm as all get-out. I intend to take this layer with me to Bozeman for WT3, just in case.