The now departed Ozo pullover was the champ in BPL's UL rain gear report recently, but it's no longer available. However, the Echo II Pull looks awesome, while being a tad heavier than necessary at 10oz.
It's not coming out until spring, but the new Gram Comp Pull looks like a sweet 6-7oz rain jacket. I'd take an extra ounce for the features of the Ozo however (ie. thumbloops).