Thing is, prior to getting my 200, I didn't even know 300's existed. I only found that out after getting my 200 and coming on the forums. Had I known that, I'd probably have got a 300 instead, least in part for the 'box; initially I wanted an auto (cos I'm getting old and lazy), but decided I didn't want the 4sp auto in the 200, so changed minds and went manual. Then decided I might as well get the Sport cos of the few spec items above the SE (lower suspension, spoiler, shiny bits inside, LSD, etc). Knowing now that the IS300 came with all that, PLUS a proper/better auto box (with tiptronic!) and more power? Fools rush in.......
Even so, I love my 200 - but I might not keep it as long as I intended to, and switch up to a 300 if one comes along that I really like and can afford...