Depends what your objectives are. If you want the best track day car get them M3. If you want the car that will show its tail lights to the other on the street get a 335IS & $1100 worth of parts. JB4 G5/ISO + FMIC. I drove both cars & felt for my DD use, street & occasional 1/4’ @ Rockingham & Fayetteville, the 335IS was the best package. Real life against a number of V8 & I6 M3’s has verified that I choose wisely. Be interesting to see a track day at VIR how much real advantage the M3 has in the hands of Average Joe non pro drivers who will not push much over 7-8/10ths.
Will take a close look at the M3 turbo coupes when they come out because it will most likely be a great dual purpose car.
2013 BMW 135is 6MT conv JB4/ISO
2011 BMW 335is DCT Coupe JB4/ISO/BMS Flash
2009 Ford Expedition 4X4 EL - 2009 V-Star
2003 Nissan Xterra 4X4 - 1998 Ford Ranger 4X4 Splash
FF Cobra Mk-IV work in progress