Make sure that Kelty Light Year is a recent model with EN rating. I have the Light Year from a few years back. It is very well built and very comfy, but the temp rating is off by at least 15 degrees. The newer models of that bag have several more ounces of down fill than the older ones, so the temp rating is more accurate. This one doesn't have a full length zipper, but there is a zipper to vent the foot box for warmer weather. Aside from being chilly in it below about 35*, I really like this bag. I'm a cold sleeper, so others may be comfortable in it a bit cooler than I am.
I much prefer to have a hood, since I tend to sleep cold, so the Coromell wouldn't be my choice.
Marmot builds excellent bags, usually regarded as probably one of the top five brands.
I noticed some good clearance prices on down bags yesterday at sunnysports.com.
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