In reply to Solar:
"Know there are some female specific bags though and wonder if worth it?"
A female specific bag is usually just a little bit warmer than a normal blokes bag with supposedly a slightly different fit.
One thing to watch out for is the length of the female bags is a little shorter, so if you are relatively tall for a woman (5'10'') you may find them too short. I know this from experience after telling my ex to get the womans mountain hardware lamina 20 bag which turned out to be a bit short ( I noticed this but never mentioned it for fear of death).
Alpkit bags are pretty good, I have a pipedream 600 (I think) that I got on offer for £125 and it's been pretty good, although be sure to get a good mat, this is very important with down sleeping bags, because the down gets squashed under your body and has almost no insulating properties. For this reason a hybrid down/synthetic bag is my favourite.
Post edited at 23:32