[Canadianpimp]

2H Weapon

Pre-raiding: I recommend actually going for a 1H + off-hand for pretty much all of raiding. This is especially true given the itemization for pre-raiding, as you usually get a better DPS combination that way. Kael'thas in Magister's Terrace drops a pretty nice staff though and is one of the better DPS blue staffs. I still recommend the 1H+OH combo though.

Tier 4 raiding: Staff of Infinite Mysteries is nice, but it isn't as good as the 1H weapons off Prince and Gruul. Having your eye on those weapons over this staff is the best way to go.

Tier 5 raiding: The Nexus Key pretty nice if you never got a weapon from Kara or Gruul, but it shouldn't make you switch to a staff.

Tier 6 raiding: Illidan's staff = /drool, but the Tempest of Chaos + Rage's off hand is definitely a better DPS combo. When you get to Sunwell, the 50 hit on Felmyst's staff make up for all the hit you'll be using with the Sunwell caster upgrades. This is probably the best way to go, and pretty much the only time I favor a staff over a 1H + OH combo.

1. Grand Magister's Staff of Torrents (Felmyst - Sunwell Plateau) DP: 28272
2. Brutal Gladiator's Battle Staff(Season 4 Arena) DP: 23824
3. Zhar'doom, Greatstaff of the Devourer (Illidan - Black Temple) DP: 23458
4. Vengeful Gladiator's Battle Staff (Season 3 Arena) DP: 21920
5. Brutal Gladiator's War Staff(Season 4 Arena) DP: 20624
6. Merciless Gladiator's War Staff (PvP Honor Reward) DP: 19824
7. Vengeful Gladiator's War Staff (Season 3 Arena) DP: 19120
8. The Nexus Key (Kael'thas Sunstrider - Tempest Keep) DP: 18776
9. Amani Divining Staff (Timed Event - Zul'Aman) DP: 18520
10. Gladiator's War Staff (PvP Honor Reward) DP: 17428
11. Staff of Infinite Mysteries (The Curator - Karazhan) DP: 14140
12. Terokk's Shadowstaff (Talon King Ikiss - Heroic Sethekk Halls) DP: 13416
13. Sun-infused Focus Staff (Kael'thas - Magister's Terrace) DP: 12684
14. Grand Marshal's War Staff (PvP Honor Reward) DP: 11904
15. Auchenai Staff (Revered with Aldor) DP: 11516
16. Warpstaff of Arcanum (Warp Splinter - The Botanica) DP: 11216
17. The Bringer of Death (World Drop) DP: 10768

Enchant:

Soulfrost - DP: 3456
+40 spell damage - DP: 2560
+30 spell damage - DP: 1920