I have the WM flash and like it a lot. The shell fabric on mine is light enough and there is little enough down that I suspect drying it out would not take long. I think the wet down problem is over stated and people are a bit paranoid about it. Exceptions being long trips in wet regions without many town stops like Skurka's Alaska trip. I also have a MB thermawrap Parka and there is no comparison. The WM is in a different league of warmth, but the Th is 4 oz heavier.
That said, I realize you were asking for specific advice, which no one has really given you yet. For a sub 1lb synth jacket hoody, I'd look at the Patagonia Nano Hoody. These jackets are surprisingly warm. After testing out the pullover, I bet the hoody would be good to about 30 doing chores. Not toasty, but good. The latest MH compressor is about 16 oz and this jacket felt quite warm to me for a synthetic. A lot warmer than the thermawrap or nano for the weight. Thats what I'd go for if I were you. However if you are looking to layer over down, then go with the nano since its got a baggier fit and won't compress the down.
Wow, just realized how old this thread is. Tossing my suggestions out into the ether.