Best Berseker one shot damage weapon?

[Any1]

A Thunder Maul has Weapon Speed Modifier (WSM) of 20. Here the amount of IAS you need to reach the various Berserk attack speed breakpoints.

IAS------Frames per attack
0 %----------23
4 %----------22
8 %----------21
13 %---------20
19 % --------19
24 %---------18
34 %---------17
46 %---------16
58 %---------15
78 %---------14
105 %--------13
152 %--------12
232 %--------11
434 %--------10

Doesn't look good does it. For a high damage and fast two-hander, you're best bet is probably a Polearms with a WSM of -10:

IAS -----Frames per attack
0 %----------17
4 %----------16
10 %---------15
20 %---------14
34 %---------13
54 %---------12
83 %---------11
138 %--------10

A few uniques shine as fast two-handed weapons:

Ribcracker (unique Quarterstaff)
Two-Hand Damage: (54-62) To (143-169) (98.5-115.5 Avg)
Required Level: 31
Required Strength: 25
Durability: 130
Base Weapon Speed: [0]
+200-300% Enhanced Damage(varies)
Adds 30-65 Damage
+50% Damage To Undead
50% Chance Of Crushing Blow
50% Increased Attack Speed
50% Faster Hit Recovery
+100% Enhanced Defense
+100 Defense
+15 To Dexterity
(has to be upgraded to elite)

Tomb Reaver (unique Cryptic Axe)
Two-Hand Damage: (99-125) To (450-570) (274.5-347.5 Avg)
Required Level: 84
Required Strength: 165
Required Dexterity: 103
Durability: 65
Base Weapon Speed: [10]
+200-280% Enhanced Damage (varies)
+150-230% Damage To Undead (varies)
+60% Increased Attack Speed
+250-350 To Attack Rating Against Undead (varies)
All Resistances +30-50 (varies)
10% Reanimate As: Returned*
+10-14 Life After Each Kill (varies)
+50-80% Better Chance of Getting Magic Items (varies)
+4 To Light Radius
Socketed (1-3) (varies)

Edit: tables didn't look right.