heck of a deal on half-zip merino tops (with thumb loops!) My small weighs just under 7.5 oz, and I love that thing; I'm buying another for sure.
Of course, the arms are on the long side, but I can deal with that.
http://www.backcountry.com/outdoorgear/Stoic-Merino-Bliss-Shirt-Long-Sleeve-Mens/SIC0010M.html
They're Lightish Weight puffies are around $50 right now, too, but I've heard they have some quality control and fit issues.

