Update added review:
I finally drove my M3 to work today after several weeks of the GTR. The M3 is fully stock except for test pipes and Evolve Stage II Tune. I really still love the M3. If money was not an option, I would keep the M3 as a DD. The drive to work today (45 miles) was really comfortable after driving the race car for the past few weeks. When I drive the M3, it feels like I am just cruising comfortably enjoying my music and a few little sporty moments of changing lanes. In the GTR, I always feel like im racing a crowd of people at the track. The sound system in the M3 is way better than the BOSE sound in the GTR. If money were not an option I would definitely keep both.