We ended up with a very low mile EcoBoost Lincoln MKT (The Flex's luxury equipped sibling), and paid pretty much what the used EcoBoost Flex's are bringing on the market. They're the same vehicle mechanically, but have a different skin on the outside. The MKT suffers a slight loss of 3rd row headroom because of the sloped roofline, but average height adults can sit back there if the space is needed. I haven't found another vehicle that has the power, efficiency, or comfort that the Flex and MKT offer.
JL