Yeah OK, my preference is to try and keep gear as versatile as possible.
I use a synthetic filled jacket(NF redpoint) and a down vest(mont) rather than a single layer.
Both together they keep me warm out in the open, in a breeze, into the minuses.
Still gives the option of wearing one of them under a rain shell (though I rarely do) or wearing the synthetic in the sleeping bag if necessary (while using the down vest as a pillow
With the synthetic you have a nice shell and some backup if it gets wet - with the down you get the Real warmth when the temp. drops...
So/ that's me!