I've got one of these from Voler; $100:



The front is all windproof material, the back is a thicker lycra so it breathes very well. Used with a cold weather baselayer I've been comfortable down near 20 F, and with a lighter baselayer it's comfortable up to 55 or 60. It will not flap in the wind unless hilariously oversized. However I'm not sure how "packable" it is... the windproof material is sort of bulky. It could be rolled and stuffed in a jersey pocket.

The only downside I've noticed is if you are overdressed your arms and forearms will sweat like there's no tomorrow.