Big fan of North face bags...can usually be found discounted a various places, great warranty and great design.
I have a NF snowshoe that goes with me on any overnight excursion...I'd rather sleep in it than between covers. Good to 0, but with a bag liner and the right sleeping clothes, good for way lower than that (and I hate to get cold).
If you spend any time in a Hennesy hammock, you may give up tent camping forever. You need trees to use it, but can't recommend this system highly enough.