Paul makes a version of their Funky Monkey Cable Hanger that clamps onto the vertical part of the quill stem. A bit pricy ($40-50) but should be the nicest cable hanger you're going to find. Get the 7/8" version for a quill stem.

I've used the Tektro fork hole-mounted cable hanger before and it works well, but might not work depending on what else you are using the fork hole for. With centerpulls it might not work as I believe the Tektro cable hanger has a recessed hole for the mounting bolt.