My long hope has been that they would come out with a good low-cost Nomex fleece. Last I heard they had something like that but it wasn't anything like cheap. Find me a fireproof fleece that works as well as the existing poly and is not to much more expensive and I'm all over it.
Good woolen knitwear is getting increasingly difficult to find at a good price due to the availability of fleece. Although fleece performs well and is lightweight I prefer a woolen knitwear simply because of the advantages of greater comfort and safety. Low end quality fleece also tends to become cheap looking and the worst for wear after only a short period.
The Arktis 1514 Woolen Antartica Shirt has been designed to be flame retartdent. Its a 70% Merino wool/ 30% Nomex midlayer garment.
http://www.lansdaleltd.com/prod.php/prod/1514GIts called the Arktis D190 in the US at $85.95. The D191 bottoms $59.95 are also available at
http://www.arktisusa.com/MilitaryClothing/Thermal/Or there is always the classic Wooly Pully.
http://www.actiongear.com/cgi-bin/tame.exe/agcatalog/level4s.tam?xax=17726&M5COPY%2Ectx=8467&M5%2Ectx=3268&M2%5FDESC%2Ectx=Woolly%20Pully%26%23174%3B%20Wool%20Sweaters&level3%2Ectx=results%2Etam&query%2Ectx=wooly%20pully&backto=%2Fagcatalog%2Fresults%2Etam
Or if this is to tactical looking then a thick merino wool sweater from the Swedish company Chevalier is excellent but more expensive.
http://www.davidgoldie.co.uk/acatalog/copy_of_copy_of_Orkney_Sweater.html