Great write up. My car is very similar to your in mods (different brands in some cases) and I feel the same way about its day to day performance.
I also prefer my car to an M3 "drive wise" as these mods (especially the LSD) have filled in a lot of the gaps inherent to the 335 and the fuel economy makes it a car I can live with at $5 a gallon of gas.
The only downside is that the m3 is so drop dead gorgeous. That alone would tempt me to get one.