Depends on your play style.
Total power (wackin the mole with a nuke in other words
)
Want the best damage? Go for 5 spec in war hammer, 3 in duel weld, and 5 in flail. Why flail over katana? Slow. The Clestial Furry is nice, but it's extra abilities are not guarantied to go off all the time. Flail of ages will slow the critter every time you hit with it. Slow an opponet, you take less damage (they swing slower), the slowed can't cast as fast, can't react as fast, etc... The only way to counter it is with free action, and not too many critters have that ability.
Versitility?
Go for long swords or 2 handed swords. There are a lot more of these with diffrent abilities out there.
For a wizard slayer, you might want to go for short swords, as there are a few that will alow you to cast haste and silence, and some that will help with immunity from charm and hold person. I would also pick sling or short bow over long bow (maybe with ToB that will change).
Good luck.
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Drink and be merry
Jimbo
"Renegade, Rebel, and Rogue"