Have you considered a 550ix MSport? The RR is indeed sexy as hell, but I would be concerned over reliability. However, I also agree with the poster here who recommended the Cayenne GTS if it's a sporty SUV you're desiring.

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2011 Panamera 4S...GT Silver / Espresso
2012 Mini CooperS convertible
2008 135i Convertible - Sparkling Graphite Metallic
Prior BMWs: `05 645CiC; `07 650i; `08 M6 convertible; `11 750ix MSport
2004 GX470