I have just got one last month so it might helpful , mine is 2012 late built - 2013 registered ( MY13 with updated bluetooth streaming music function ) .
i paid a tad over 60K for it ( car is like new condition, 30K on the clock , 1 mature owener with full service history , 1+ year factory warranty ) so it might give you an idea of price wise .
In my experience , this sort of car takes time to find the right one so dont rush it . Make sure you have it checked at Lexus dealer before making a decision.
After 3 weeks of ownership , i glad that i pulled the trigger as it is totally awesome :)