ahhhh, my specialty, are u a v/t or pure smiter??
but my suggestions would be silence, fury for runewords, in v/t duels i find that fury > silence due to OW and how ezly foh can be negated.
theres also a MUCH BETTER choice to 4 ber/2um weapon, a simple stormlash wit um imo is better, where learning how to charge is very usefull, if u DONT LIKE CHARGING then some other high end smite weapons would be:
preists X of quickness
rose branded X of quickness
both preferably a base speed 0 or better, flail, axe, sword
2x socket ber/um
generally if u want the smite duel to last more than 20 secs go um's if not use bers, as senesia mentioned CB is only affected by their BASE hp (excluding things like BO) and only does 1/10 of their life and OW is based upon clvl, and both are resisted by DR so choose wisely as it affects ur pockets too

some other smite weapons that are considerable would be the redeemer, asterons iron ward, and the perf smite weapon a perf heavens light shael +um or ber

OT side note: zagggon felt the sting of my fury scourge lol...