Every day there seem to be less and less nice clean examples with FLSH and a complete stock setup. I guess what I am saying is that unless you are very patient, I wouldn't get too hung up on colour.
All down to personal taste, but I'd go for any colour except red, which doesn't suit the car and black which is so boring.
Finally go into ISF ownership with eyes open. Reliability per buck, I still think the ISF is unbeatable, but things do go wrong, and when they do, parts are expensive and you'll potentially be in the hands of Lexus stealers and a warranty system that isn't necessarily as good as you may think