Oh, there's good charts in DDR -- Holic, So Deep, and Max 300 (all Heavy) come immediately to mind for 8-9-10 difficulties. For the most recent mix, I like Xepher Oni (not Heavy) and Max 300 Super-Max-Me mix Oni (DEFINITELY NOT HEAVY).
Oh, I do make simfiles myself. Go to
my subforum on this site (note, you will have to register to download the files but that doesn't take long), download a few of those for Stepmania, and if you want to rip them apart go ahead. :P Note that I am an ITG player by nature and my charts are much more ITG like than DDR like.
Also note that I wasn't staff on this site when I joined <_<