I have the CLD 2950 and also have disabled the HQ circuit when capturing I found that letting the ADVC 300 do the NR makes a much better job, I think the only difference between the two players is the ac3 rf output and the digital frame store.
When I manage to get hold of some french thx discs (keep getting sniped dam 56k connection!) I will post some captures.
I do feel a bit lost with all this virtualDub and avisyth talk, is this all PC only software?