As far as I can tell. Rab and Patagonia are the only companies that make the lightweight down jackets. Just had a quick browse and cant find any others.
Rab do make a fair few different colours of their Microlight tho, so maybe still worth a look?
Synthetic could be a more versatile way to go, but for the weight it wont pack down as small as down. Look at stuff like the Montane Prism, Rab Generator, Rab Photon Micro.
EDIT: Just seen a Mountain Hardware down jacket. But it looks a bit horrible! HERE