When it gets a bit nippy first thing I reach for is a Paramo jacket or smock with an Explorer top.
With that type of material there's no contact chill and windproofing is excellent.
When it gets really chilly I use a Paramo Torres smock (here) often with not much on underneath.
I have a Furtech Claw but haven't done a winter with it yet - so far though it seems as warm as Paramo.
If you get a Furtech I'd advise getting at least a size larger than normal as they seem cut to be a sleek tight fit with not much on underneath - I personally don't like this - I'd rather have a bit of bagginess so I can cram on a fleece if I need to.
I'm a bit sedentary, high energy people might like the sleek fit.
The lower arms are particularly tight and you wont be pulling them over your elbows when the sun comes out 'but' there are very long pit zips.