Hello,
This is my first post, I will try to give you something new :
I think that one of the best felted wool is from germany. They have a special process with knitted wool, the name is "Walk". It is not Loden since loden is from a cloth.
One of the best brand use wool from Schoeller the swiss german factory. The name of the brand is "Mufflon.de". I have tried to give you some link and some reviews (in french) from a french buschraft forum, but I am a newbee so it is not possible to give you a link.
Mufflon is very heavy (780g/m²) but very nice. I have a jumper in this quality. The quality is amazing.
I have jumpers from Devold, Dale of Norway, Saint James or Barbour : all of them are very good specially under a shell like ventile, pertex or microfiber. But, If you want to wear a jumper alone : walk wool is really nice since it could cut a little wind.
A nice review from a friend
with translation in English here. This is with a lighter wool :
http://www.davidmanise.com/forum/index.php/topic,33474.0.html