Ibex has made several jackets matching what it sounds like you need. The nice thing about the wool is that it stays warm even if you sweat into it or if it rains.
(I sweat horribly, so suffer horrible chilling when I stop riding. Wet clothes are not fun! Wool makes it better.)
I have the Pingo, which is a wool softshell. Trek420 has the Breakaway, which is softshell on the front and wool knit on the back and sleeves.
The Ibex outlet is the way to go: http://www.ibexwear.com/shop/products/4/0/womens-outlet Keep an eye on it for goodies. Full price gets kind of scary. Sierra Trading Post http://www.sierratradingpost often has Ibex on the cheap, as does 6pm http://www.6pm.com
I always wear this: http://www.teamestrogen.com/prodPI_4968_2.html for visibility, and it also functions as a nice layer to keep the chill out of the front and let the heat out of the back.