Logitech MX518: 16% (53)

Microsoft Wheel Mouse Optical: 15% (49)

Razer Abyssus: 14% (46)

Razer DeathAdder 3G: 12% (38)

Microsoft IntelliMouse Explorer 3.0: 11% (37)

SteelSeries Xai: 3.4% (11)

Microsoft IntelliMouse Optical 1.1: 3.4% (11)

Older or other Razer models: 3.1% (10)

Logitech G9x / G9: 2.8% (9)

G500 or similar Logitech: 2.8% (9)

Logitech MX300 / G1 or similar: 2.5% (8)

Razer Salmosa: 2.2% (7)

Other: 2.2% (7)

Logitech MX510: 1.8% (6)

Cooler Master CM Storm Spawn: 1.8% (6)

ZOWIE EC1/EC2: 1.2% (4)

SteelSeries Kinzu: 0.9% (3)

Kensington "Frankenmouse": 0.9% (3)

A4 Tech any: 0.6% (2)

SteelSeries Ikari: 0.6% (2)

ZOWIE MiCO: 0.6% (2)

ROCCAT Mouse: 0.3% (1)

Ball mouse: 0.3% (1)

PureTrak Valor: 0% (0)

R.A.T customizable mouse: 0% (0)

The poll is clear!

Update: The "WMO / IMO 1.1 / IME 3.0" entry and its votes were removed. 3 new entries were added for each mouse.