We went with the 8 seat, I'm no fan of potentially leaky moonroofs, so no loss there. My thought was we will use the 2nd row for three child seats for now and once we relegate one of the boys to the back I can pull the middle seat to give me captains chairs for later down the line. But you can't really add the option of you go with the limited with glass roof.
And as for the wheel sizes, no issue there as I will pick out a nice wide 20" wheel next spring and relagate the 18"s to winter duty.
Just my $.02, your milage may vary.