We just purchased a 2003 IS300, for 18,000. What is the KBB on this lexus. But in my personal opinion maybe let him drive around your sisters car until he get more experienced. A friend of mine sold her Mercedes with only 20,000 miles on it to a first time driver and withing the first few weeks. It was crashed. Also a Lexus for a first time driver, insurance maybe a little pricey. My sister was a first time driver and bought a brand new Toyota Corolla. Oh my goodness, was her insurance high. I believe total with her insurance was about 200 because it was a new car. However it may differ being that the car is used. you sister could just call and ask for quotes for insurance.