I plan on purchasing a used Lexus LS430. This will be my first time purchasing a used car of any type, so do you know what I should pay close attention to? I know that there are lots of warnings saying make sure you know what state it came from, to make sure it isn't a snow state, due to rust on the bottom of the car. Also, how much use should I expect out of a 2004 used LS430, or even IS300 with about 100k miles on it? With proper maintenance, can I expect it to last me a good while? I plan to be doing a lot of driving, albeit in town only, as I work in a job that involves meeting clients on site and it could be a stretch across the city in a matter of hours at a time, back and fourth 5 to 6 times a day.