If i go to Lexus.com and build a 250 RWD or AWD with my zipcode, the highest option you can get is the voice navi system, heated seats, etc... and xm radio. If i wanted to get the ML system, power steering wheel, tilt side mirrors, etc... the only way i could get it was to buy a 350. Im guessing it has to do with where you are located. Maybe they stopped putting the ML system in the IS250????