Hi,
I owned LS400 '92, LS400'99 and now LS430'01 and latest model (430) is much, much better then LS400..
More comfortable, navigation is updatable (DVD), seats ventilated, turning radius improved, audio can be controlled from driver wheel buttons, more horsepower, driver seat has more options, suspension has additional mode - sport. I had two cars in the same time LS400 (very strong condition) and LS430 (need to be invested) and after two weeks of driving on LS430 I decided to sell LS400 (with no regret).