Going through the same problem at the moment, im looking for one that will handle springs in the pacific northwest so kind of different environment.

What i have found is what matters the most being warm or having a small bag. Snugpack is one that i have found that is both warm and small in synthetic. they are just hard to get after hours of searching. Snugpak

Found alot of people who review them say they are great, they are common in the UK.I but the Kelty that was recommened is probably what i will go with myself for my trips this year.