Originally Posted by AntBabeee
What do you mean by ES SE and ED?
These are trim levels.
hierarchy, it looks likes this for the 3 Series range:
ES (Poverty Spec) - do not buy this
ED (EfficientDynamics Edition 320d), SE (This is where you should start and then move further on if your budget allows)
Sport Line (max. 320i/d)
Luxury Line, M Sport
This differs for the US and other continents.