I would recommend the 08 Sedona. After two model years, Kia pretty much had the bugs worked out by then. I have two 06 Sedonas. One with 187,000 miles, and the other with 213,000 miles, and they have been great vehicles. Things that are pretty common repair are:
*Cradle mount bushings
*Sway Bar links
*Sliding door latches (may have been fixed by 08, check with your dealer)
I'm sure I'm missing some, but those are really the only issues mine have had. The main thing that distinguishes between SWB and LWB is obviously the length. Other distinguishing points would be:
*LWB models will have 'LX' or 'EX' at the lower right corner of the tailgate
*SWB models have removable 3rd row seats, while LWB models have fold-in-the-floor 3rd row seats. They fold COMPLETELY flat, and leave a nice deep well when they are in the upright position.
*SWB models have a lower-grade cloth interior.
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Both of my Sedonas are LWB models, one is LX and one is EX. The 2nd row seats come out very easily. The 3rd row seats fold flat, but if you REALLY want to take them out, each side is held in by only 4 bolts, so they can be removed easily with 10 minutes and 12 mm and 14 mm sockets. I can't really give you too many bad points about the Sedona, because I don't really have any. I usually get great fuel economy, the ride is smooth and comfortable...and thanks to a low residual value, you can pick up a used one dirt cheap!!