1 - Batman Begins. Seriously, the panther-like neck on the cowl takes the cake. Batman really looks like an animal ready to kick some serious butt in this suit. Even when you're watching the extra "cape and cowl" on the bonus DVD, you get a shot of Bale putting the suit on without the cowl, and even with no specific lightning or anything, he looks beast-like, huge and threatening.
2 - Batman Forever's sonar suit. Sure it looks like one of those funny-looking Batman action fig, but I always liked the fact it was the first Batsuit on screen with a big Bat symbol across the chest. Plus it had no nipples -if I remember well-, and I liked some of the little liberties they took with it anyway, like the little fangs on the mouth opening of the cowl.
3 - Batman Returns - I always felt that the suit had an... "armor" quality to it that reminded me of the Dark Knight Returns... for some odd reason. Couldn't explain why but it's just the way I feel.
4 - Batman 89 - I just never liked the yellow oval around the symbol... It really bothers me. Other than that, for the time, it's a pretty nice suit. It got old though, now that I look at it again.
5 - BF and B&R basic Batsuits - Nipples didn't really bother me at the time -I was a kid- but now they just look so out of place that I can't enjoy watching the movies themselves. This, and the ears which were far too long as well.
6 - B&R ice suit... Oh... God... How could they? Just... How could they?
I won't rate the Dark Knight one just yet, I'm waiting for the movie to be released so I can judge it from every single scene it's featured in. For now I'd say it'd rank just after Batman Forever's sonar suit and before the Batman Returns one, its flaws being the shape of the cowl and of course the now infamous "leg-maze". Other than that, I absolutely love the concept. For now.