I think you got a reasonable deal on the car having bought it from a dealer. Sure you could have probably gotten a cheaper deal if you had bought it privately, but I would never buy a vehicle from a private owner unless I knew them - too many risks and very little recourse if you get a bad apple. I do hope you plan on owning it for a while because if you do try and trade it in anytime in the next two or three years you will probably be very disappointed in what you will get for it in trade. But that's just the nature of buying a late model luxury vehicle.
Your Kids like it, your wife likes it and you seem happy with it.... don't worry about it. Just drive it and have fun!
