Wait hold on a sec, so is the extra seats for kids or for the in-laws, or what? You just mentioned "The family's growing" but didn't specify HOW it's growing. Now if it's for the in-laws, I don't think you really need the extra seats all the time, which leaves you with many other choices. But if it is a must to carry around 6-8 seats, then go with either the LC or Sequoia. Now you mentioned RX, 4Runner, and Highlander? RX doesn't have a third seat, and as you may know, the 3rd seats in the 4Runner and Highlander are a joke(even in the GX). IF you want comfortable 3rd seats, go with a Suburban. Now if you don't want American, and have extra $$$, shoot for the GL450 (trust me, they're the most comfortable 3rd seats you would ever sit in!).