I love coiled cables! When I got myself a Model M I had to get one with a coiled cable 
Has anyone tried these 3m cables from China that are floating around on ebay?
The stock Model M cables came in "short" (longer than normal) and "long" which are silly long. I have never really stretched one very far, but they are probably well over 2 meters relaxed, and I am sure that they would stretch to at least 3 meters. I have 1 or 2 of the long ones, and they are almost ridiculous.
PS - the SDL-to-USB cables from orihalcon are the way to go.