I used the Kona3 card to do just what you proposed in the above post. It will downconvert on the fly as you bring the footage into FCP. I used a Sony HDW-F500 to bring in the footage for the offline and the online as well. It worked fine with only a couple of issues, in particular the sync reference for playing back at 23.98 fps. There is a setup in the deck itself to switch the reference to internal for playback. Set the Kona3 reference to freerun while capturing and it will work without problems. If you are going to offline at 23.98 and online at 29.97 keep in mind the timecode weirdness that may result from the different frame rates.
As for conforming on a Nitrus system, use Automatic Duck for the transfer and it should work. Personal preferences aside (I usually use Final Cut, but we also run a pair of Avid Symphonys here) the idea of conforming on a Nitrus is not all that dumb. Even though pixel for pixel the quality should be comparable, the Nitrus does offer a number if advantages. It’s color corrector is far superior to FCP’s color correction. Unless you buy a plugin such as Final Touch for FCP, the Nitrus CC is one of the best in the business. Color grading on the Nitrus would be a good reason all by itself. Use the right tool for the job.
And that, folks, is one of the few times you will EVER hear me praising an Avid system. Mark you calendars! Today was the day. 🙂
tom