I have also been toying with the idea of these two cars (R & 335i) for my next car. But have you thought of the e92 328i? My friend had one which was only base + m package and that car was the funnest car I have ever driven. It wasn't fast (GTI felt faster) but definately a blast to drive.
I want the umph of a 335... Power was good on the 335 stock. If I didn't care about that, I would get one... in the blue I want.