I am going to have to agree with Honed Diva on all accounts this time. I really am not a fan of any DCX vans. All I have heard about are tranny problems, warranty will usually cover it, but its still a waste of time.
I would seriously look at the new Entourage or Sedona. They seem to be right between the Domestic Mini-vans and the Japs.
The new Hyundai is definitely something to check out and it comes with the warranty and a decent price tag to boot.
The Nissan Quest that I have been in all had hidious, cheap feeling interiors. I liked the power train but the inside was the major turn off.
i'd give the Koreans a closer look as well as the Mazada MPV.
But you seem set on the DCX. Going that route definitely buy a slightly pre-owned one. It's not worth taking the depreciation hit for a new domestic vehicle nowadays.