The Nissan isn't nearly as roomy as the others inside, and handles clumsily.
Kia has an all-new Sedona coming for 2015 that could be excellent. The initial info is promising. The current one is somewhat dated, and its reliability has been iffy.
If you have to buy a van ASAP, I'd drive the Honda and the Toyota, see which one you like the best, how much the bottom-line prices differ, and pick between them accordingly. You'll find my personal comparison between them in the "more about" beneath the photos.