Also yes Shadow of Mormon is amazing and needs a sequel yesterday.
Looks like WB games may have heard you. An enigmatic teaser appeared on their website for a game coming in March and the smart money is on either a Shadow sequel or another Arkham game.
i'd much prefer Lady Teldra (Godslayer) from the Taltos saga, or any of the Great Weapons from that series (Blackwand, Pathfinder, Iceflame), and Glamdring or Orcrist from LotR would be good candidates as well.
my favorite sword is still Stormbringer from Elric of Melnibone. i wouldn't want it myself, but it's really cool...