In my opinion the ci just looks a lot better than the 4 door.  I think the styling is much better.  Both are beautiful and I wouldnt mind having the sedan, but the coupe makes my heart skip a beat.  Haha.  No, but really, I get compliments on my ci everywhere i go.  Im not used to people stopping me just to give me a compliment on my car, or giving me thumbs up because of my car because I used to drive a 94 camry, and a green one at that.  Haha, but yeah, I love the ci.  If you can afford to pay a little more for the coupe, I would say in my opinion, it is worth it.  
2004 325ci...lovin it!