Tim at EE has a great deal on seconds material. A long thread going over on Backpacking Light. Some people prefer a bag in very cold conditions, I would agree although I have not ever owned a quilt. When I replace my existing bag, I may opt for a quilt, the weight savings for a side sleeper is not much, but cost is quite a bit less if going with EE's deal on second material, as long as that lasts. Hope you come back to reply.
Duane