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@ph1
I am currently using all three options (Quill, Ahead, Adaptor) on various bikes.
Quill stems are definately more "flexy", but on older steel frames they simply look so much better than anything else.
The adaptors are good, IMO. They need to be set up right (in terms of matching clamping area height to the stem) to get the invisible look noted above. They do eliminate the major source of flex in a quill stem.
Back to the original question, I personally would not clamp on to the threaded part of the forks, with or without a shim. I would use an adaptor
http://www.probikekit.com/display.php?code=A1123