The Toyota will likely be the most reliable all else being equal, but you can probably buy a much newer Chrylser or Dodge within your price limit. I like the Chrysler and Dodge much better after their 2011 update, but imagine those are still too expensive. The 2008-2010 chew through brake pads.
We don't have much reliability data on the Sedona. What we do have indicates iffy reliability.
For eight-passenger seating within your budget the Toyota might be your only option. The Kia has never offered it, and the Chrysler only gained this option for 2017.
You don't mention the Honda Odyssey. It has been available with eight-passenger seating, but I'm not sure for how long.