After talking to paul at leceister, I'm going to settle on a nice black IS250 SE with the multimedia package and auto (seeing as the SE-L version has just added rain sensors, option to have anti collision and a better interior wood trim! all for 2 extra smackers)
Apparently, Lexus GB are goign to let the dealers have a run of the IS250 around the track aroudn oct 8-10, so pitch yrou question to the dealers then