I recommend getting the Campmor 20 down bag, either mummy or rectangular. Both are lighter than the bags you currently list and will pack smaller. I have the Campmor 0 down bag and find the quality of it very good given it's price. I would buy another. On-line reviews of the Campmor bag are also very positive. The 20 vs 40 -- 20 is the better bet. If too warm, easy enough to open the bag, but if the temperatures drop unexpectedly, it is so much nicer to have a warm bag. I also recommend buying a bag liner to help keep the bag clean; silk is nice, and I've found the Kelty Poly/Cotton Blend Hostel Liner also nice inside a sleeping bag (or on top in warmer weather).