I am about to special order a 2010 335i coupe. I plan on getting the M package, primarily because I like the wheel designs offered. Some questions: (1) Does the M package include a stiffer suspension like the Sport package? (2) What are the advantages/disadvantages of going with the 18" vs 19" wheels (other tha cost)? (3) Does the M package come with run-flat tires? The internet description only states, " mixed performance tires," whereas the Sport package explicitly states "mixed run-flat performance tires." I'm also considering the Logic 7 sound system but have seen some bad reviews of this upgrade. Any comments? Finally is active steering worth getting?