I just switched to thin merino wool base layers this year and haven't looked back. I have a Patagonia and Smartwool one, both bought on sale. They have the 1/4 zip, which is nice when it gets hot.
I just got the Ibex Indie Hoodie in the mail and it is very nice. The added hood is great. Here is the link as they are on sale for $70 from $100.
They are comfortable, dry fast from my experiences this summer, and DON'T SMELL like nylon/poly shirts. 14 days in the Brooks Range in my Patagonia top and I had typical BO, but my shirt didn't stink!