Bontrager Packable Stormshell - Gregg's Cycles
This is what I have. Really light, packs up into a square about the size of a rear jersey pocket and decently warm. I like the yellow over the black just because its different but color is up to you. Great jacket overall. I also have the cannondale Morphis. Its a good amount warmer and breaks into a vest, and is pretty water resistant, but its a little heavy for 70º even in vest form