I would not buy a Lexus without the Luxury Package.
I purchased a 2008 IS250 AWD in November, 2007. The dealer only had 1 IS in stock with the Luxury Package.
The Package contains the following:
Seat Memory settings for the driver & passenger
Rain sensing wipers
HID headlights
Auto dimming outside mirrors
Power adjustable steering column
Power rear sunshade
Illuminated scuff plates
I do not understand why there are so few vehicles with this package.
Buy this package and forego the Navigation System. Instead purchase a portable Navigation System. It will be better than the System that Lexus uses.