I'd like to move to a "threadless" stem on my '83 Paramount, basically for the convenience, selection and future proofing they offer.

Can anyone point me to a nice threaded - threadless stem adapter? The ones I've fould look pretty cheesy and heavy. The one at Nashbar even has an iron wedge and several have a taper between the two sections making it hard to use spacers. Did any of the specialty/custom road/MTB manufacturers make one?