similar thing happened to me january 4th, i hit some black ice on a corner at slowish speed and spun round twice smashing into the kerb, my IS300 is in the repairers now, over 4 grands worth of damage.
three new wheels and tyres, whole rear suspension, subframe, rear bumper, rear abs sensors etc.
still havent got the car back yet, looks like its been a realy bad time for IS owners