4 door sedans can be fun!! I used to autocross our E39 M5. It sounded great, but wasn't competitive. I got tired of losing to the wife in her E36 M3, so I ended up getting the M Coupe. Still lost to her for a year until I got sticky tires, and finally improved the driver.
Current: '13 E92 M3 Euro Delivery
Wife's: E39 M5, E36 M3
Gone: E86 M Coupe; E30 M3