They, the X & the 745, are two different automobiles entirely. I love them both due to their "ultimate driving machine" qualities, however, in purchasing my X; coming from my jeep I owned in college and having no need for excessive passenger space, my decision was a no brainer. Although I can somewhat understand your indecisiveness. I ordered a porsche, didn't accept delivery of it though. Yeah, they were a little pissed...I believe my decision was based on how long I figured I had before my "single w/no kids" days were over. Anyway, good luck!!!!!!!!