I thought it was time to do a V8 powered sports sedan poll. So vote for the car you like and post why you voted for it. I did not include the e90 M3 sedan because it has not be shown yet.
2008 Mercedes-Benz C 63 AMG
Power bhp (kW) at RPM: 457(336) / 6800
Torque lb-ft (Nm) at RPM: 443(600) / 5000
Weight lb (kg): 3813 (1730)
Acceleration 0-60 mph s: 4.3
Top Speed mph (km/h): 155 (250) - electronically limited
2007 Audi RS 4
Power bhp (kW) at RPM: 420(323) / 7800
Torque lb-ft (Nm) at RPM: 317(430) / 5500
Weight lb (kg): 3637 (1650)
Acceleration 0-62 mph s: 4.8
Top Speed mph (km/h): 152 (250)
2008 Pontiac G8 GTP/GXP
Power bhp (kW) at RPM: 420(307) / 6000
Torque lb-ft (Nm) at RPM: 406(550) / 4400
Weight lb (kg): 4036 (1831)
Acceleration 0-60 mph s: 4.9
Top Speed mph (km/h): n.a.
2008 Vauxhall VXR8
Power bhp (kW) at RPM: 420(307) / 6000
Torque lb-ft (Nm) at RPM: 406(550) / 4400
Weight lb (kg): 4036 (1831)
Acceleration 0-60 mph s: 4.9
Top Speed mph (km/h): n.a.
2008 Lexus IS-F
Power bhp (kW) at RPM: > 400(298) / n.a.
Torque lb-ft (Nm) at RPM: > 350(475) / n.a.
Acceleration 0-60 mph s: < 4.9
2007 Cadillac CTS-V
Power bhp (kW) at RPM: 400(294) / 6000
Torque lb-ft (Nm) at RPM: 395(536) / 4400
Weight lb (kg): 3850 (1746)
Acceleration 0-62 mph s: 4.6
Top Speed mph (km/h): 163 (262)


2008 Mercedes-Benz C 63 AMG
Power bhp (kW) at RPM: 457(336) / 6800
Torque lb-ft (Nm) at RPM: 443(600) / 5000
Weight lb (kg): 3813 (1730)
Acceleration 0-60 mph s: 4.3
Top Speed mph (km/h): 155 (250) - electronically limited


2007 Audi RS 4
Power bhp (kW) at RPM: 420(323) / 7800
Torque lb-ft (Nm) at RPM: 317(430) / 5500
Weight lb (kg): 3637 (1650)
Acceleration 0-62 mph s: 4.8
Top Speed mph (km/h): 152 (250)


2008 Pontiac G8 GTP/GXP
Power bhp (kW) at RPM: 420(307) / 6000
Torque lb-ft (Nm) at RPM: 406(550) / 4400
Weight lb (kg): 4036 (1831)
Acceleration 0-60 mph s: 4.9
Top Speed mph (km/h): n.a.


2008 Vauxhall VXR8
Power bhp (kW) at RPM: 420(307) / 6000
Torque lb-ft (Nm) at RPM: 406(550) / 4400
Weight lb (kg): 4036 (1831)
Acceleration 0-60 mph s: 4.9
Top Speed mph (km/h): n.a.


2008 Lexus IS-F
Power bhp (kW) at RPM: > 400(298) / n.a.
Torque lb-ft (Nm) at RPM: > 350(475) / n.a.
Acceleration 0-60 mph s: < 4.9


2007 Cadillac CTS-V
Power bhp (kW) at RPM: 400(294) / 6000
Torque lb-ft (Nm) at RPM: 395(536) / 4400
Weight lb (kg): 3850 (1746)
Acceleration 0-62 mph s: 4.6
Top Speed mph (km/h): 163 (262)