depends if you wanna go melee for ranged, i assume you are ranged cuz of widow, facets do affect enchant, if you need resists use coh if not use ormus, charms should be fire gc's but not every one has 10 so use w/e you got mainly aim for fire gcs, the more facets and % to fire damg will be better than any other damg charm (enchant + fire gcs + % is geo metric no question on this). down side is if they use absorb its gonna be a long duel, however its your preferance to choose fire over physical damg, what ever u like better is your choice, only fire damage from enchant will be higher than phsyical