Nick,
sounds like your in heaven, as anyone owning an LS.
Only today I was thinking would I get another Lexus and just use the 400 as part time car, but on the way home I could see no reason to do so, also governed by lack of parking where I live to park a spare motor.
Still I might pop off to a dealer in next 12 months and see whether anything else Lexus would take my fancy especially as just made last payment on the mortgage and so maybe some spare cash later on. Oops, just remembered I have a wife, so maybe not!!