I have a 2008 M3. Love it. It is the car I have had the opportunity to enjoy the most of all cars I have owned. The GT is the car I most appreciate and cherish. The GT is the hands down the best car I have ever owned and probably will own.
The M3 is the car you can drive day in and day out and throw stuff in and take your family with you and still enjoy the driving experience in what ever the manner you wish to drive it in. You can park it and walk away from it knowing no one is going to touch it out of envy or spite. It you get the convertable you get the best of both worlds given its a hard top. Very reliable. Even good in the winter on winter tires. The electromagnetic suspension is fantastic for smoothing out the rougher roads which makes it such a great daily driver yet in sport mode make it a great car to go hard around corners. Go standard. The SMG sucks the big one. Engine is smooth and 400 hp is enough to enjoy with about 16+mpg in full on city driving. Would have no hesitation recommending one.