[pct-l] Sleeping Bag recommendations

[Jerry's gmail]

I'm planning a 2017 PCT thru-hike and after 40 years of backpacking (less than 3 weeks a year) I want to go much lighter on all my gear. I'm looking for opinions on quality 20F-30F down bags. I've looked at Western Mountaineering's 20F Ultralite @ 29oz; 30F Megalite @ 24oz and ZPacks 20F (6'1") @ 18oz.
I'm 5'9" and ok with a "regular" width mummy.
Are there other models you would recommend?