For a warrior, it would mostly be dark iron gear, which is crafted with faction with the thorium brotherhood. Not sure of the items or what levels of faction youd need though.There are probably also drops of just straight FR gear for warriors from strath. I got a 20 FR leather belt off one of the tower bosses. Ive seen other types drop as well.
Then there is always those librams of resileance (sp?) that give +20 FR to any head/leg item (i think its those).