Advice from a recent LX570 buyer. I grabbed an 15 LX570 27K miles 5 hours away on lucky break with the Lexus site. I drew an 8 hour circle around Atlanta and subdivided that area into 3 160 mile sections. With then I divided the east west into sections and found zip codes for intersecting lines 90-180 miles apart. Ok here's why. On the Lexus CPO site you enter Zipcodes. So for me I entered a zip code roughly straight 120 miles away and that includes Atlanta, 240 miles away includes the 8 hour distance and inside to the first zip code. I played on the site for about 10 minutes a day and finally a CPO 15 LX570 showed up 5 hours away. I called and discussed it, drove 2 days later to pick it up. CPO warranty better than new and you can get the Platinum warranty for pretty cheap insurance. Included 4 services at the time of pickup 30, 35, 40, 45K miles as well.
OK the car. Best riding road vehicle I've driven period on Comfort @ 70-100MPH. Over 100 most cars are better than SUV's. Eats road trips for lunch. AHC is critical to this, although cannot explain the technical details. ML stereo is amazing. So good I broke out my iPod classic and upgraded to 120 GB drive and new battery for lossless music. AMAZING. Essentially I got a 98K flagship SUV for less than half price, but it's still a Japanese built flagship SUV.
For what it's worth I wanted a Land Cruiser, but not 1 used one anywhere in the US when I was shopping worth the risk. Wasn't going to get a 75K mile + SUV, although now I know I was mistaken in that line of thinking.
As for ditching AHC for upgraded suspension, nope, not a chance. AHC proved itself to me in the first week of ownership for my needs. The height control for maintenance, and easy of entry. The Sport/Normal/Comfort settings (Comfort >60 Normal <60, Sport rarely) provide excellent body control for what is a 3 ton whale of a vehicle. Light fire road, trail offroading sure NP. Rock crawling, not my cup of tea, will be a passenger in someone else's vehicle. Snowmageddon in Atlanta this winter, bring it on.