If it was me i would remove the DPF and have a remap. I have only just bought a 330d and will be considering it in the near future.
The only reason i am going to do it is because i seen a post from AMD tuning just off the m25. They deleted the dpf and remapped a 330d it went from 225bhp to 301bhp on a dyno. Thats quite impressive in my eyes, might make my mpg slightly better once its been done with some steady driving