In reply to Ross88:
Hi Ross,
I can strongly recommend the Mountain Equipment Vega Jacket:
http://www.mountain-equipment.co.uk/the_gear/clothing/insulation/vega_jacke...
The Vega is a lightweight down jacket with a stitch through construction, helmet compatible hood and water resistant outer. It is very similar to the Rab Neutrino Endurance.
Mountain Equipment gave me the Vega to take Alaska last May. Initially I was very skeptical that such a light jacket would be warm enough for such a cold place. Thankfully my fears were unfounded and it kept me warm as I stood on the summit of Denali at 11pm having just climbed the Cassin Ridge.
The hood on the Vega is especially good. The baffles are elasticated, which means it is nice cozy around your head if you are just wearing a hat. Yet it will also stretch over a helmet with out feeling restrictive.
After wearing the jacket every day for a month it still looks like new, though my girlfriend thinks it smells a bit, which is good because it stops her stealing it!
I'm pretty critical of my gear and there are very few bit of kit I would describe as perfect, but I can't think of a single way to improve the Vega.
ME did give me this jacket free, however if I didn't like it I wouldn't recommend it.
I hope you find the helpful.
Tom