My layering system currently is a poly t-shirt baselayer, a 50/50 ls dress shirt for the sun, a Patagonia R2 fleece and a windshirt with a poncho/tarp. This does me pretty good down to about 40F to freezing standing around. I want to push it further and am thinking I should get some sort of hooded jacket.
I thought about going the synthetic route but then I would just be buying a new jacket every 4 years and I am cheap. I have a Montbell Alpine Jacket and Nunatak balaclava but it rarely gets down to 10F around here anymore and when it does get to there and below it is usually wind chill. These are usually overkill. Also it would not be usable in that 40F to below range when it rains. Should I go the Downtek route and get lightweight water resistant warmth or is there something else I should be looking at?

