S3 : shock absorbers, springs and spacers

[Luca79]

Hello, I need your advice guys.
I want to install a set of Bilstein shock absorbers and Eibach spring on my S3 with 17'' wheels.
The car will be lowered by 20/30 mm.
My question is: should I install four spacers as well?
I saw a lowered S3 without spacers and the aesthetical result was really bad, the wheel was quite hidden.
On the other side, I know that spacers can stress a lot some parts of the axles, and make the car a little slower.
What size (if I should put them) would you suggest to me?
Thank you very much! [img]/ubbthreads/images/graemlins/smirk.gif[/img]