This month's R&T Magazine has an article of performance SUV's in it. A comparison of sorts against:

Porsche Cayenne Turbo
Chevy Trailblazer SS
Jeep Cherokee SRT8
Range Rover Supercharged
Infinity FX45
BMW 4.8is

Interesting read if you're into that sort of thing. Surprisingly, the Jeep is the fastest 0-60 and 1/4 mile, besting the Cayenne Turbo. Our friend the 4.8is did ok, but showed its age against its competitors. It did have the fastest speed through the slalom though, which I think is interesting considering it had the worst skidpad g rating.

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Scott in Cincy
2008 X5 4.8 (wifey)
2009 AMG E63 (Daily Driver)
1997 Porsche 993 Turbo
1968 Mustang GT Fastback -- Resto Project
1969 Firebird 400 -- Resto Project (Trans Am Replica)
1996 Saturn SC2 -- LeMons Racecar!