I recently went down this same road. I needed to get rid of my ECS slotted rotors (junk) and Mintex reds. I didn't want to spend more than $300 due to temporary budget constraints

so here's what I looked at:
Zimmerman crossdrilled
ATE Power Discs
ATE OEM plain
Zimmerman OEM Plain
Brembo Plain
All these discs were made of the same metals so, there was no hope of finding one that would last longer than the others but, the plain face rotors would provide a bit more suface area for the already small stock brake size. Crossdrilled is cool but, lets face it, there's almost no benefit to them on a OEM size A4 brake system.
The one rotor that stood out to me was the ATE power disc. It was very unconventional and that interested me. They are designed to create a dual slot pattern that sweeps the pad faces in a criscross pattern all the time. This pulls heat outward, pulls cool air inward and also scrapes the pads evenly while dragging dust away from the pad area via centrifugal force. Each rotor was $50 from Impex.
I bought a set of PBR Ultimate Ceramic pads from ECS and I have to say they a really well rounded. I have yet to fade them out during my daily commute and they NEVER EVER squeak. Sweet pad.
Overall my cost was $100 for rotors, about $60 for pads and I even bought a can of new brake fluid for $10.
The one thing that is very important in this case is that I also bought the Wet braking shields that Audi made to replace the non-exsistant ones on all 1996-2000 A4 cars. They made a HUGE difference in the rain. Whenever it rains, the car stops as fast as it does on dry days. No more last minutes stops on the highway off ramps. I also bought the other half of the wet braking kit. It's a set of plastic guides that attach to the belly pan edges to channel rain and water away from the wheel wells and pul it to the car's floor pan area. I have yet to install them but, I will soon.
Here's the part numbers and what I paid:
8D0 698 998 - $12 from Impex for both metal shields and new bolts.
8D0 698 998A - $11 from Impex for four 3/4" thick ABS plastic guides that snap onto the belly pan's outter edges.
Here's a comparison of the OEM -vs- wet braking shield kit:
http://www.audiworld.com/tech/wheel31.shtml
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