If you're not hell bent on getting a quill stem for the looks, get threadless by all means. The stiffness alone is worth it.

Here's the best BF post about the subject, with 2 scary shots of how ****ing flexy quill stems are.

Thread it comes from

Edit: I think it's pretty ridiculous to whine about how the evil corporations are shoving a vastly superior technology down our throats... look for conspiracy theories elsewhere.