well, that depends. If you don't have ToB, then you're stuck with:

Staff of Magi
Carsomyr
Celestial Fury
Crom Faeyr
Red Dragon Scale
Shadow Dragon Scale
Armor of the Hart

However, if you coughed up the extra $ for ToB, then you can get a +5 or better weapon for every proficiency type. (except katana, only +4 there, boohoo.)
the best are, imho:
Ixil's Spike +6
Staff of Magi
Carsomyr +6
Shuruppak's Plate
White Dragon Scale

Good luck.