The rain jacket won't make you any warmer, just wetter inside. 8oz and good good breathability is a tough one. The Marmot Super Mica is 9oz, but has the rest of your specs, including the pit zips. They make a very bight orange color. I see Backcountry.com has a sale.
If you can live without the pit zips, the OR Helium II is spec'd at 6.4oz. They make red and orange. I have more faith in OR products and the warranty is real. Now I want one, durn it :) Maybe the parking lot sale!
Or get a poncho, save $140 and keep your windshirt :)