Sounds good - not a bad price either.
From what I am aware (and someone will correct me if i'm wrong) the difference between the S and SE is;
Leather interior, Electric Seats, Premium stereo system, 16" wheels instead of the 17's.
The Sport over the SE has;
Aluminium pedals and side plates, LSD and sport suspension, Tinted rear quarters and the boot lip spoiler.
Has the car got full Lexus service history etc etc?
If serviced correctly they are good for at least 170k - got yourself a bargain by the sound of things.
Well done and welcome :D
PS - any pics?