OK, here's how the story ended:

I got the Gore Passion Jacket/Vest in blue (which perfectly matches my bike):

http://www.teamestrogen.com/products.asp?pID=7569

It is perfect. Warmer than the Descente I first ordered, water resistant (enough for my needs - I have something else for when it's pouring and even then I won't go out if it's pouring), wind resistant, perfect for both running and biking.

The weather is currently in the 4-10 degrees Celcius range here in Vancouver. I wear the jacket for road riding (I wish I could wear it to commute but I don't have to, I live right on campus). Under it, I usually wear a longsleeve lightweight underweight and a long- or shortsleeve jersey, and I remain warm and toasty for the length of my ride. I also take it running and then again it is perfect. Only once did I feel clammy in it, and that was because I was overdressed under it.

The only negative sides I see are : could have more reflective material (although it's not too bad) and the pocket zippers should be easier to open (that's easy to fix, I just added a little bit of rope so I could more easily grab it). Kinda expensive at 139$ but not so bad considering the quality.

I am confident I will be able to wear it until the end of Spring (weather shouldn't dip under the -5 Celcius mark here) and maybe even occasionally in the Summer. In colder temperatures, I will just add layers.

Thanks to all who provided feedback on this question, and happy Winter riding!