You have staggered wheels, so that's going to be a bit more difficult. I supposed a 245/35-19 will work both an 8 and a 9" wheel...a bit shorter than stock, but not too bad. Your speedo will actually be more accurate now.
In general though, you should look into downsizing to 18" wheels to improve your ride.
Conti DWS is a softer-ridign all-season which maintains some level or performance. Soft sidwall, but will help a lot in ride comfort.
NO RUN-FLATS!
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'02 S54 M3 (500/500 GC/Koni)
'08 N54 135 (JB4, DCI, BMW PS/Bilstein B6s, H&R M3 FSB, Strongflex FCABs)
'14 N55 X1 (JB4, BMS DP, BMS Intake, Alpina TCU reflash, H&R Sports, Bilstein B6s, E93 M3 RSB, Strongflex FCABs, baby seat)
'08 N54 535xi touring (Bilstein B6s, Downpipes, MHD tune, baby seat)