Hi Liz. I did most of my research on
www.astrosafarivans.com . They are a great group of people with multiple moderators, many experienced and active members, all willing to help out, and no drama or attitudes. Tell 'em T.Low sent you and they'll give you hard time for sure.
16' wheels and four wheel disc brakes were a priority for me, and they are only available from 2003-2005. Low miles was somwhat important also, so i ended up with a 2003.
You will get much more indelth answers on asv (astrosafarivans.com).
Cheers,
Tom