To me, bar none, the greatest 911 in history if the 911R. No other 911 even comes close. The “pretender” to the throne is the Carrera RS—-so here’s a beautiful picture with a 911R in the foreground, and a Carrera RS (edit: I actually think that is an RS-R, not an RS) in the background.
photographer: Willem De Zeeuw
IEDEI 
It’s an RS; the RSR would have larger front fender flares over the wheelarches.