In reply to Mike_Bottom:
I have the Arctic Dream 1400 and think it's a great bag. I've not tested it in very cold weather yet, only down to about -5, but it's very warm and i don think ive needed to zip it all the way up yet. The make is good quality, and it has a pretty good pack size when compressed in its sack and not too heavy (can't remember the exact weight but I'm sure it's online.
I've only slept in it up to about 4800-5000m and been lucky with weather so far so not tested it anywhere near it's limit yet but so far am very pleased with it (apart from the fact that they dropped the prices a couple of months after I bought mine!)