Hey, I used yokomo slicks with the yokomo rubber inserts.
They really stick to the ground for me.
Just my .02.
I run the same car as you to, so they might be a good choice for you. They were for me.
Peter
big boi - if u are concerned about straightline accel - stick with something that has the least amount of rolling mass. This will aid in increased accell.
Since u have an RS4 - u dont really need to worry wheel spin