In reply to mtom91:
What's the budget?
Nuclei is certainly light and pack small, spendy though.
I use a Cumulus pullover, which is rather good for the money. Packs small enough to clip on ones harness, hood is big enough to be used with a big ass helmet and also warm enough to be used as a belay jacket in Scotland and Scandinavia. The jacket version might be better though.
http://sleepingbags-cumulus.eu/uk/categories/jackets/climalite-full-zip?gid...
Mont Bell also makes a lot of lightweight insulating jackets, but can be hard to come by in Yurp.
I'm sure Montagne and Rab also have something to offer.