I admire your want to use the DTS audio but be warned that you will have to tweak it to fit. The NTSC set is missing frames compared to a standard cinema print so the audio won't fit 'out of the box'. The 5.1 AC3 track from that set, however, will match up perfectly and it has a true discreet LFE.

I think you should avoid the DV codec if possible. Its lossy so you are compressing your video three times in that workflow. If you can only capture in DV, then perhaps using a lossless codec for the intermediate file or just encoding directly to MPEG2/AVC whilst removing the pulldown would be better.

I'm currently working on producing a similar project using the PAL discs, which are missing only couple of frames here and there, specifically to show case the DTS audio. I've found that I'm probably going to have to find a better copy of Empire. Its littered with odd noise on the copy I have. Speaking from experience, my copy of the NTSC set plays with crosstalk in one player and it is absent in my other player, so it would seem its not always caused by the discs.