Give DMS Automotive a call too - they'll do a very neat map, exhaust and DPF delete package which will do the following;
- Make the 30d/35d engine sound a much purer straight six and sound smoother
- Add probably around 50hp in total, maybe more (the 330d engine maps from 241hp to over 300hp with this sort of kit)
- Lose the DPF concerns too and you can do the short journeys without a concern
You are very very likely to get the DPF problems if you don't: let it warm up, take it for a 20mile round trip and do a 'hot' drive above 50mph around once a month or so. I've got a DPF'ed 2.0 TDI in my A3 running Revo stage 1 and I do roughly the same to protect it.