I have 2013 Sienna XLE with 42k miles. Zero issues but a used one will cost you $20k. 2011 Sienna was the first model year after the re-design. You'll see some first year problems with 2011 but the 2012-14 have very good reliability.
Grand Caravan/T&C - You can get a lot of van for little money but expect issues. Read up on their problems and see if it's something you believe you can "accept".
Odyssey - 2012 was the re-design. Average reliability but $$$$. They drive very nice.
Sedona - See GC/T&C.
Ford Flex - Funky style but a good vehicle. Drives nice but on the pricey side even used.
Good luck