I haven't bought a headset yet but I'm considering several options.

1. A new style catridge bearing Ultegra. The few on Ebay sold before the seller got back me with the crown race size. I am considering a headset offered up by a C&V member.

2. The Stronglight A9 is a possibility if I cant find an Ultegra within a reasonable amount of time.

3. Stack height. I wouldnt get anything taller than a 38-ish. My Merckx has an extra spacer which gives me an extra 2mm.

4. While many of the previously mentioned headsets are of 600/Ultegra quality they would look odd on a more modern bike. Big bulky cups wouldnt look quite right to me.

5. After 2 pages of posts, oddly enough, the Ritchey is still towards the top of my list, it has the proper stack height, its reasonably light at 140g, and the overall quality (in my opinion) is on par with the 600/Ultegra. To bad it has that goofy black top cap.