hi mate
check out the Nanok range, its the one most talked about on this forum, good bags and reasonably priced for the quality.
give Andrew at outdoorcode a call or check out the website, i think its
www.outdoorcode.co.uk
no involvement with them, just had a positive experience!
go for the -10 as you can always take a layer off, and if you are a hammock person somtimes they can be a little chilly!
Dingo.