If your looking at those... deffinately look at the IS350's I bought one when i sold my cobra... I haven't looked back yet... the interior is what sold me on the car and it drives like a dream. And its fast, obviously not as fast as an 03 cobra, but i have riped a few 13.4 @ 105 runs up and new england drag way in it... and its bone stock.
Given a choice, i'd pick the IS350 as well.
Both cars are nice but the rwd aspect would increase the fun factor i'd think.