Best settings for DVB-T MPEG-2?

I've been looking at the decoder properties for my PVR software and there's a number of settings that I think could be tweaked to produce better results but I'm not sure what I should choose. 

Quality: "Obey quality messages", "Decode I frames only", "Decode I,P frames only", "Decode all frames"

Deinterlace: "Weave", "Vertical filter", "Field interpolation", "VMR", "Auto"

Condition of deinterlace: "Always", "Interlaced frames", "Progressive frames"

What do you suggest as the best choices?

Is it possible to record/capture the raw transport stream then use dgmpgdecode & avisynth for decoding & processing? If so, I'd suggest that would be a better option. 

I did a test capture not long ago using a DVB-T Usb stick and VLC, using the "dump raw stream" option. Even though I tested it for just a few seconds, it seemed to work fine.

Thanks for the replies, from what I can see there's no option within the PVR software (nPVR) to record a transport stream without some form of processing being added within the decoder.

As I said, just use VLC. You don't need the pvr software.

Can you elaborate on your method please? I've rarely been able to get VLC's options to work.  

Sure. I'll write a small guide as soon as possible.