If it were my money:
* I'd favor the IS300, out of the 2 cars listed. The new 3 is so hideous, I personally can't stand to look at it.
* I'd also look at the Certified Pre-Owned IS300s. Who knows, you might find a low-miileage lease return and save yourself a couple thousand dollars.
* Ultimately, though, the new IS350 would be my ideal candidate. It has a sculptural beauty that makes the new 3 look clumsy and half-assed.