in this thread:
http://www.e90post.com/forums/showth...aded+sway+bars
two track guys (the Hack and CJ421) weigh in on the topic of what has the most impact on handling (not swaybars). Nice hierarchy and both say similar things.
edit
and here's a nice piece by a vendor
http://www.e90post.com/forums/showthread.php?t=982498