I just picked up my 2007 IS 350 (Black Saphire Pearl) with DVD + ML, 18" Wheels. It is an absolute pleasure to drive. My earlier sports sedan was a 2001 Audi S4. The Audi is an excellent vehicle, but did not have the refinement of the Lexus. For the money -- the Lexus has the performance, refinement, and build quality. For the money this is an oustanding value.
More leg room in back, and more clearance getting in/ out -- especially in the back seat.