The Coruscanti seems common enough; there are three in my LS at the moment that I know of.
I'd vote Defending Ring.
Lengthy process for a KS99 fight (accumulating KS or converting others), fighting Chlevnik, hoping for a Savory Shank, then making bargains with the universe for a ring instead of a goddamn Pixie Earring.
Or you could just buy the Shank, which will run 7m to 9m depending on your server.
I know some poor guys that are 0/30+ (after the shank update).