You don't really need a winter jacket for those temps - just something to keep the wind off. Layer a fleece or wool vest or long sleeve jersey under it for warmth depending on what you prefer. Personally, I like the Gore stuff but tends to be on the pricey side. Performance sometimes has one on sale. The one with zip off sleeves is nice for those cool but not quite cold temps. Got mine on sale at REI.

http://www.performancebike.com/bikes...72_-1___400070