I ordered mine in november '07, delivery expected for may '08. The dealer told me changing to the sd would not change the delivery, they have a second quota for sd's.
The shipment from US to Belgium takes 4 to 6 week, and getting on, or missing the boat is what delay's the delivery, so they told me.

I thing I'll go for the sd, nice to have the extra NM.

Did anybody do engine tunning for the sd?