Amazon.com : ZOOOBELIVES 10 Degree F Hydrophobic Down Sleeping Bag for Adults - Lightweight and Compact 4-Season Mummy Bag for Backpacking, Camping, Mountaineering and Other Outdoor Activities – Alplive D1500 : Sports & Outdoors
www.amazon.com
I looked at the fill specs (comparing other manufacturers) and it seems adequate. I also said considering Amazon's return policy there's not much to lose on it.
EDIT: I just saw your 6' 5". I guess it's not an option then...