the 3.0sd is obviously 'nicer' to drive than the 3.0d, in the end the sd has some 50 or more hp more than the std 3.0d...
is the 3.0d therefore lame or slow?
Nope! I enjoy my 3.0d every day and I have never felt like she's underpowered (something I did experience when testdriving the Q7 or Touareg).  There's enough power to maintain decent BMW-speed 

  and to make the others eat your dust at a red light... 
 
 
bottom line: you should drive them both and decide for yourself...