You could go for a plastic GW Chaos Warrior, make one hand weapons free (cut away the weapon) and make the sword in the other hand bigger (maybe use a plastic two-handed sword from another kit or just glue two swords together). You could lean the sword on his shoulder and maybe glue in a decapitated head in the other. it's perfect for a heavily armed and armored warrior as long as you cut away those chaos icons, it's the perfect buff warrior...
ps. I have a better track record with weapon swaps in plastic then in tin (unless I can pin it, which is difficult to do with a sword). Keep in mind that it will often be picked up by the two handed sword to move it around.