for daily driving it's my opinion that you can get away with the cheapest you can get your hands on.
When my 318is was stock, i changed my brakes every second year when it was up for inspection. (they are wery cheap here). And i have never experienced any problems. Even though i like braking, and have always been hard on them.
I started getting warped discs when i changed my entire suspension and brakes to M3. Even though i installed Zimmermann which is a brand name. I then changed to Jurid discs. They warped too... I then changed the left caliper after some investigation, and installed my old Zimmermanns which i had had turned down. Since that i have had no problems.
It's my experience that the most problems with brakediscs on daily drivers are with hanging calipers super heating the discs. And not the discs them selves. So you should be okay with what everyou find.