I have a 60mm Canon macro that I love for the fact that it is little and extremely lightweight and works wonderful with my Canon 50D. I would however recommend getting something with a longer reach if you are interested in close ups of things like flowers, insects etc. I have to get too close with my camera to my subject, so I would prefer a larger zoom for my macros but that is based on what I like to shoot. if you are doing portraits etc with your macro, then a shorter range is definitely better.
Simone aka email@example.com
My Camera: Canon 50D
My Lenses: Canon 35mm, 60mm, 24-105, 70-200 & 100-400 plus Sigma fisheye
My software: Photoshop CS6