I have a longsleeve 1/4 zip in midweight merino wool from Minus 33 that I am in love with. Even better, I got it for $35 as a discontinued style/color. Even at regular price, I would buy again:
http://www.minus33.com/catalog/men-s...t-1-4-zip/714G

I have merino wool socks from Smartwool that I have been using for a while, and they are 5 stars too:
http://www.smartwool.com/mens/hike-light-crew-1200.html