Copy pictures and movies from memory card

I'm completely new to Hazel and trying to create what I thought would be a fairly simple rule, but I feel like I'm missing something. What I'd like to do is: when an SD card containing a "DCIM" folder is inserted, move all the pictures and movies into a folder on my Mac, with the folder structure named according to the date the picture was taken.
Here's what I have so far:
If:
Kind is Image or Kind is Movie
Do:
Run rules on folder contents
Move to folder Pictures
Rename with pattern "YYYY_MM_DD"
Sort into subfolder with pattern "YYYY > MM"
Which mostly works, but if I import twice on the same day, I end up with one folder named "2012_11_20" and an additional one named "2012_11_20-1". Is there any way to sort into an existing folder, or is there some part of this I could be doing better?
Here's what I have so far:
If:
Kind is Image or Kind is Movie
Do:
Run rules on folder contents
Move to folder Pictures
Rename with pattern "YYYY_MM_DD"
Sort into subfolder with pattern "YYYY > MM"
Which mostly works, but if I import twice on the same day, I end up with one folder named "2012_11_20" and an additional one named "2012_11_20-1". Is there any way to sort into an existing folder, or is there some part of this I could be doing better?