Dave, I hope you don't mind me continuing this great thread, I think it applies.
I'm driving myself insane trying to decide what system is going to work for me. I even made this brain-numbing spreadsheet to compare the bags I'm interested in:
Sleeping Bag Comparison
I love my WM bags, and while light weight is important, it's only important if I sleep well. I don't think I could do a hoodless bag in the winter, but I do think I could do one in the summer, provided it zipped all the way to the bottom to open up when it gets hot.
Here's what I'd like:
- a 30-35* bag or quilt for summer
- a 10-15* bag for cold nights in the spring and fall, and mild winter. honestly, this bag will probably get more use than a 30* bag for me since I sleep so cold. I'm pretty sure I want a hood for this bag.
- a -10 to 0* setup for cold winter trips (I only do one or two of these a year, and weight isn't a big issue here)
I think I could get by with two bags, then combine them for super cold winter stuff.