I could go with a quill, even though they are kind of a pita. What is a good source for quills?
I love quill stems. I prefer them over threadless stems. I find them superior in both form and function.
If you want classic though, you might want to keep your stem sleek and simple. Afterall, not every single component on your bike needs to scream.
I think any of the stems on this page will do just fine:
http://www.peterwhitecycles.com/stems.asp