I need a minivan

I've been searching for a week or so and finding, as expected, that the used market here is nearly as bad as the rest of the industry but there are some models that seem to have slid under the radar. Either that or their reputation for reliablity sux. I'm seeing Mazda 5's, Chrysler T&C and Kia Sedonas lower than others.
I've heard that the ChryCo vans are gremlin plagued over about 110k, why and are there exceptions? I like the interiors more than the others and the later ones with the Pentastar lump ought to have pretty reasonable power. What about the AWD Dodge Caravans, are they gremlin plagued too?
A local dealer made a point that some years of the 5 are getting hard to find parts for, is this actually a concern? Are they generally reliable enough that this shouldn't be a disabling problem? I like the thought of a 5 speed manual in a van and if they're tall enough inside for bikes with the wheels on I'll deal with some quirks.
The Sedona looks kind of plain compared to most other than the Dodges. How do they drive, are they reliable enough, are service and parts easy enough, how do the interiors stand up against the others?
I'm also coming across some older AWD Siennas that are nicely priced but not until they get over 150k, is this a problem or are they typical Toyota and good for 200k with basic maintenance? I've heard about questionable transmissions on some years of the AWD Sienna, are 2010/11 prone to that issue? What else should I look at if I go to check out some of these?
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