Is your LeMond coming with the Campagnolo headset? Tange makes good headsets, but if you're getting the Campy or can get the Campy, why not use it?

NOS Chorus headsets should be in between the Tanges and a Chris King as far as price.

A headset shorter than the original MAY and SHOULD be a workable solution, but a headset with the original stack height WILL be workable.

Barnett's Handbook is floating around as a pdf, at a site called icelord. The chapter on headsets has a compatibility guide with a table of headsets and stack heights. You can at least see what does match your bike before buying a new project.