Congrats bud. You won't regret owing a Lexus. My last one. An IS200 Sport 2002 plate lasted me 12 years and would have still been going. Yet sadly was hit at 60mph on passenger side and was written off. Never had a single issue. OK timing belt, idler, tensioner, brakes which are wear and tear. But never a big issue.
Moving on in regards to upgrades or mods. Tint it all round. Limo tints on back screen and windows and get a legal one on fronts. Do your headlight bulbs perhaps a HID upgrade. Maybe some bumper spats to give it a more aggressive look. Remapp possibly? But make sure you go with some reputable company with a dyno. EGR delete? Boot lip spoiler is a must I think and enjoy whatever you do to it.
Let us know what you do it and post some pics once done.
Enjoy and Happy motoring..