This is my setup. I have mine between grips and shifters since mine are trigger shifters. But for twist shifters you'd want to go between those and brakes. I have no problem reaching my brake levers from my grips with the bar ends in between. They only move in by the width of the bar end clamp, which isn't much.

http://img.photobucket.com/albums/v3...e/IMG_8027.jpg

http://img.photobucket.com/albums/v3...e/IMG_8100.jpg