With the reported 0-60mph of 5.9s for the TDI and all that torque how will it compare to the S5 at higher speeds?

I am fighting with my wallet and emotions as I have an early deposit securing the 4th A5/S5 into my dealer. I am torn towards the A5 TDI with such an impressive 0-60.

Then there is my 2yr long deposit on an M3.... although I am worshiping audi for saving me from a higher spend, and I think I will take the A5 and hope to sell my option on the M3!

So to clinch my choice for the TDI... what do you think the step acceleration figures will be?

My UK dealer tells me they had to place orders last year for their A5 and S5 demo vehicles and he expects them to become available some time in March. Has anyone else been told the same?