I don't know if this will help you out at all, but here is a picture of my 8P3 on 19" RS4 style alloys:
And a picture of them on the 8P2...
The RS4 looks amazing on your latest car Warren, still one of my all time favourite rims but if I had to choose between them and your 19" Rotors the latter would just win for me.
Beautiful, beautiful colour.
I'm torn on the above. Whilst I adore the BBS wheels you get on the E46 M3 CSL, I've never been a huge fan of the other BBS wheels design wise. I'm a fan of minimalist design, and the BBS rims are too a bit too fussy for me unless they're quite dark (like on RicoS3's car).
I like straighter spokes, and to be honest my rotors weren't a first choice as they're a bit soft edged. Hence why I put the RS4's back on the car to see if they cut it. I changed as I felt I needed something new on the new car, and the RS3's came up at a time when I was head scratching and I liked the idea of having an OEM RS rim to be honest. The other rim I adore on the S3 is the MTM 19" which look gorgeous with the sharp spokes and the silver face with the grey innards
Like Milltek, I think BBS is a default choice so I'm going to put the cat amongst the pigeons and say the 19" TTRS Grey!