Sheet music ranked by difficulty

Hi,
could you please recommend any composer who has sheet music sorted by difficulty ranking ?
I know only David Nevue
http://www.davidnevue.com/sheetmusic.htm
I bought few sheets from him already but the next one I like is too hard for me :-)

Thanx a lot.

that's a fine idea

I wish http://imslp.org/ would feature a category like that, "By Skill Level".

http://www.scoreexchange.com/ has a way to view pieces by difficulty.

I just posted my question if anybody own the sheet collection on CD called "Piano Scores Unlimited" from 'http://www.emediamusic.com/pianoscores.html' and could share his/her experience. The comercials claim that the 630 pieces in there would be ranked by difficulty. I am waiting for a user feedback on this, and this might be helpful for you as well.

My thread "any experience with "Piano Scores Unlimited" is here:
http://www.pianoworld.com/forum/ubbthreads.php/topics/1972609/%20any%20experience%20with