I just picked up my new IS 350 with Nav and 18" wheels. Love the exterior styling. Tons of options are standard and fully loaded comes in considerably under the competition (328i, A4 and G37). Drove all three, driver feedback seemed to rank out with the BMW and Audi with a very slight edge the G37 was comparable in driving feel. All 4 were nice and decision was tough. It came down to bang for the buck, reliability, and maintenance costs and the Lexus was the clear winner in these vital areas. For the record 2nd choice, BMW 328 or 335i but cost for comparably equipped car was not realistic for me.
Voice recognition, bluetooth integration, keyless entry and start, Navigation features, backup camera.
Lengthen the car by 3-5 inches for more back seat room but do it without trashing the styling. Offer a manual tranny option and/or tighten up the shift points on the auto. These are suggestions for a very well refined vehicle.