The Icebreaker Nomad is a nice piece, but I don't like it for hiking due to the weight, it's extremely warm. Right now, I consider it my most durable casual sweater, since I've had it a few years and it's had no pilling.
Icebreaker also makes the Quantum Hood at 260 g/m2. I have their first version of it, it was lighter then (220 g/m2), and it had a lined hood. I cut the lining out of the hood because it was too hot. Now I like it for hiking.
Nau makes a the M3 Hoody, which is 300 g/m2. The fabric doesn't stretch enough and the cut makes it feel more like a jacket than a base layer or insulation layer. I consider it for casual use or day hikes only.
Another option is from Rambler's Way, they make a button wool hoody, but they don't list the weight.
http://www.ramblersway.com/shop/mens/tops/411-mens-button-down-hoodie
If I hadn't already gotten so many wool hoodies, I'd pick up an Ibex Indie. I still may get one.