Nice cars! I can't believe I'm saying this but I think I prefer the 335d over the M3. I dare say though the M3 WILL catch up once you've finished modding it.
I've often thought my ideal car would be a 335i\M3 combo, a tuned N54 petrol engine to give the low down grunt, real world pace plus lower running\fuels costs combined with the suspension\running gear and external looks of the M3.
How did you go about converting the 335d to the M3 look? Is there a build thread?