If you want a shooting method that'll allow you to have vibrant colors and/or a very "contrasty" look, you're gonna basically need to do it in post using color correction. The DVX100 is an excellent camera, but the Cine-like gamma curve it uses for 24p mode has a *very* unforgiving ceiling when it comes to whites. You widen the iris more, and more, and more, and it all looks good, and then--boom--you hit the ceiling and suddenly the colors give way to a very harsh-edged white area.
For scenes in open daylight, try putting the ND filter on 1/64 and f4.0 for the iris. If it's late afternoon, step down to 1/8 and push the iris to f9.6--see how that works. You should be able to modify the colors to any extent you want using either FCP or Avid's color-correction filter.
Whatever you do, though, don't overexpose on the DVX; you won't see the ceiling hit through either the viewfinder or the LCD; it'll look much more graduated live than it does played back. I'm the writer/director of "Asylum", and that lack of knowledge during principal photography cost us more reshoots than we would've liked. But your post caught my eye, because you're planning on using the same kind of chromatic look and everything that I used for a large part of the movie. Hope everything turns out well.
i co-directed a feature called 'blue in green' that was shot on three dvx100's. its showing at the american cinematheque in los angeles on december 16th. if you're local, its a very atypical romantic comedy.
They did a great job with the DV footage. I have used them before for tape to film for a couple of projects.
The lifetime showing is straight from video and Pan & Scan, but you still get to see what can be done. The whole "film" was final color corrected thru a Spirit DataCine with, at times, several Power WIndows going.
This is more of a melodrama but there are humourous bits and some nice "warm-n-fuzzy" romantic scenes.
I do try to not go too warm too fast when going warm-n-fuzzy. The warmer tones do seem to get warmer faster on this camera, at least in the full on Cine-mode. My impression.