The Canon 60D got rid of the automatic gain control.
Probably subsequent canon models will follow suit.
That means you can use the juicedlink,and plug in XLR mics to the camera.
Which would be better on the 60d?
A juicedlink, with an xlr shotgun mic, or an H4N?
Obviously, with a juiced link you don't have to sync the sound in post.
H4N is about 300 bucks.
This juicedlink is about 200 bucks:
And then you still need a mic and xlr cable.